RE: [PHP-DB] # of Records in Table
You are incorrect regarding my appreciation of the help I receive from the list. I very much value the help received from everyone who is a contributor to the list. This is one of the reasons (of many) I chose to develop with PHP/MySQL. At this point in time I mainly receive help, however, when my knowledge and experience increases I hope to help those with questions. And the wheel goes round and round. Zach -Original Message- From: DL Neil [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 24, 2002 2:02 AM To: Zach Curtis Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table Zach, On the subject of sharing information we differ big-time: have you heard the story about the three blind men attempting to describe an elephant? Apparently you have failed to appreciate the self-help nature of the list. No one is paid to help you. However your behavior demands/evidences more goodwill and effort from your (several) correspondents than you have demonstrated yourself. "Relational" technology is all about the logical interrelationship between elements of data, both between tables and within a table. Perhaps some reading/revision is required. Accordingly without information about the subject-table, you are left with the two somewhat-artificial solutions offered: incremented field or timestamp as key, and a nagging feeling that wonders if there might be a 'better way'. You have just mentioned the serial file/data source. That opens a whole new avenue of attack! However time and goodwill can both be quickly exhausted. Let us know how you get on with the suggestions made so far, and if they don't work/you think there might be a better way, consider another approach for assistance. =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: 24 January 2002 00:01 Subject: RE: [PHP-DB] # of Records in Table > There are many columns of data in the table. The only column that I would > like to extract a value from is the password field (this is the key as > well). I do not have an AUTO_INCREMENT field. Although, I see how adding > that field could be of use by using it with the SELECT MAX() as you > mentioned. > > The last record is whatever the last record was inserted using INSERT INTO. > To give you the overall picture of what I am trying to accomplish: > > 1) I am opening up a db table and searching for the password of the last > record in the table > 2) I then open a flat file and search for that password and grab the next > record after that (as records are appended to the end of the flat file) and > any other subsequent records added to the flat file > 3) Write those new records to the db table > > In this scenario, the last record would be the last record from the flat > file added to the db table. > > Another suggestion from [EMAIL PROTECTED] was to: > > Select your password field, and whatever other fields you need to > Use > -mysql_num_rows() to capture the number of rows returned > -mysql_data_seek() to position pointer on last row (remember indexing > starts at 0) > -mysql_fetch_row() or mysql_fetch_array(), your choice, to return the > data. > > This is done with one select statement, however all the passwords from the > table have to be loaded into array (perhaps not the most efficient way? But > better than what I had come up with.). > > I do generally find that the more brief I am in describing an issue, the > more likely I am to get a reply. Then details can be given if needed, in > further correspondences. > > I will give that AUTO_INCREMENT and SELECT MAX() a try as well. > > > Zach > > -----Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 3:27 PM > To: Zach Curtis > Cc: [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > We're going back and forth on this and getting no where... > > So far all you have informed us is that the table has one column, which > contains a bunch of passwords (I also > suggest that this is not really the case and there'll at least be some sort > of userId field - but you haven't > bothered to tell me/us that) > > The concept of "last" in relational terminology is ambiguous. Do you mean > last entered, or do you mean the row > with the field containing the highest value in the column - for example. > > Some people are used to the idea that there is also some 'phantom' rowId > that counts/labels each row. In other > file systems this might have been the case, but the physically last record > in an RDBMS table-file may not > conform to either of the "last" definitions menti
Re: [PHP-DB] # of Records in Table
Zach, On the subject of sharing information we differ big-time: have you heard the story about the three blind men attempting to describe an elephant? Apparently you have failed to appreciate the self-help nature of the list. No one is paid to help you. However your behavior demands/evidences more goodwill and effort from your (several) correspondents than you have demonstrated yourself. "Relational" technology is all about the logical interrelationship between elements of data, both between tables and within a table. Perhaps some reading/revision is required. Accordingly without information about the subject-table, you are left with the two somewhat-artificial solutions offered: incremented field or timestamp as key, and a nagging feeling that wonders if there might be a 'better way'. You have just mentioned the serial file/data source. That opens a whole new avenue of attack! However time and goodwill can both be quickly exhausted. Let us know how you get on with the suggestions made so far, and if they don't work/you think there might be a better way, consider another approach for assistance. =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: 24 January 2002 00:01 Subject: RE: [PHP-DB] # of Records in Table > There are many columns of data in the table. The only column that I would > like to extract a value from is the password field (this is the key as > well). I do not have an AUTO_INCREMENT field. Although, I see how adding > that field could be of use by using it with the SELECT MAX() as you > mentioned. > > The last record is whatever the last record was inserted using INSERT INTO. > To give you the overall picture of what I am trying to accomplish: > > 1) I am opening up a db table and searching for the password of the last > record in the table > 2) I then open a flat file and search for that password and grab the next > record after that (as records are appended to the end of the flat file) and > any other subsequent records added to the flat file > 3) Write those new records to the db table > > In this scenario, the last record would be the last record from the flat > file added to the db table. > > Another suggestion from [EMAIL PROTECTED] was to: > > Select your password field, and whatever other fields you need to > Use > -mysql_num_rows() to capture the number of rows returned > -mysql_data_seek() to position pointer on last row (remember indexing > starts at 0) > -mysql_fetch_row() or mysql_fetch_array(), your choice, to return the > data. > > This is done with one select statement, however all the passwords from the > table have to be loaded into array (perhaps not the most efficient way? But > better than what I had come up with.). > > I do generally find that the more brief I am in describing an issue, the > more likely I am to get a reply. Then details can be given if needed, in > further correspondences. > > I will give that AUTO_INCREMENT and SELECT MAX() a try as well. > > > Zach > > -----Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 3:27 PM > To: Zach Curtis > Cc: [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > We're going back and forth on this and getting no where... > > So far all you have informed us is that the table has one column, which > contains a bunch of passwords (I also > suggest that this is not really the case and there'll at least be some sort > of userId field - but you haven't > bothered to tell me/us that) > > The concept of "last" in relational terminology is ambiguous. Do you mean > last entered, or do you mean the row > with the field containing the highest value in the column - for example. > > Some people are used to the idea that there is also some 'phantom' rowId > that counts/labels each row. In other > file systems this might have been the case, but the physically last record > in an RDBMS table-file may not > conform to either of the "last" definitions mentioned above. There is no > such 'highest' in an RDBMS unless you > put it there - as mentioned by another correspondent, it's a good idea to > use some sort of 'id' field in every > table. This can be generated for you with the AUTO_INCREMENT feature. With > appropriate design, eg first record > has id=1 and the succeeding records have id-s with ascending values, then > you can use SELECT MAX() against the > 'id' or possibly against the AUTO_INCREMENT feature. > > These commands are well documented - RTFM. Many tutorials with
RE: [PHP-DB] # of Records in Table
Zach wrote:
"I do generally find that the more brief I am in
describing an issue, themore likely I am to get a reply. Then details
can be given if needed, infurther correspondences."
I would like to disagree with this. I am only a newbie to php and
have found that if I can describe to my best ability the problem I'm
having I can get a reply that helps me in the best way in 1 or 2 replies.
There is none of this back and forward and end up still getting nowhere.
You have to wait for some replies, but they are worth it.
---Original Message---
From: Zach Curtis
Date: Thursday, 24
January 2002 1:02:07 p.
To: DL Neil
Cc: [EMAIL PROTECTED]
Subject: RE: [PHP-DB] #
of Records in Table
There are many columns of data in the table. The only
column that I wouldlike to extract a value from is the password field
(this is the key aswell). I do not have an AUTO_INCREMENT field.
Although, I see how addingthat field could be of use by using it with
the SELECT MAX() as youmentioned.The last record is whatever
the last record was inserted using INSERT INTO.To give you the overall
picture of what I am trying to accomplish:1) I am opening up a db
table and searching for the password of the lastrecord in the
table2) I then open a flat file and search for that password and grab
the nextrecord after that (as records are appended to the end of the
flat file) andany other subsequent records added to the flat
file3) Write those new records to the db tableIn this
scenario, the last record would be the last record from the flatfile
added to the db table.Another suggestion from [EMAIL PROTECTED]
was to:Select your password field, and whatever other fields you
need toUse-mysql_num_rows() to capture the number of rows
returned-mysql_data_seek() to position pointer on last row (remember
indexingstarts at 0)-mysql_fetch_row() or mysql_fetch_array(),
your choice, to return thedata.This is done with one select
statement, however all the passwords from thetable have to be loaded
into array (perhaps not the most efficient way? Butbetter than what I
had come up with.).I do generally find that the more brief I am in
describing an issue, themore likely I am to get a reply. Then details
can be given if needed, infurther correspondences.I will give
that AUTO_INCREMENT and SELECT MAX() a try as
well.Zach-Original Message-From: DL Neil
[mailto:[EMAIL PROTECTED]]Sent:
Wednesday, January 23, 2002 3:27 PMTo: Zach CurtisCc: [EMAIL PROTECTED]Subject:
Re: [PHP-DB] # of Records in TableZach,We're going back
and forth on this and getting no where...So far all you have
informed us is that the table has one column, whichcontains a bunch of
passwords (I alsosuggest that this is not really the case and there'll
at least be some sortof userId field - but you haven'tbothered to
tell me/us that)The concept of "last" in relational terminology is
ambiguous. Do you meanlast entered, or do you mean the rowwith the
field containing the highest value in the column - for
example.Some people are used to the idea that there is also some
'phantom' rowIdthat counts/labels each row. In otherfile systems
this might have been the case, but the physically last recordin an
RDBMS table-file may notconform to either of the "last" definitions
mentioned above. There is nosuch 'highest' in an RDBMS unless
youput it there - as mentioned by another correspondent, it's a good
idea touse some sort of 'id' field in everytable. This can be
generated for you with the AUTO_INCREMENT feature. Withappropriate
design, eg first recordhas id=1 and the succeeding records have id-s
with ascending values, thenyou can use SELECT MAX() against
the'id' or possibly against the AUTO_INCREMENT feature.These
commands are well documented - RTFM. Many tutorials with plenty
ofexamples of authentication techniquesexist on the PHP/MySQL web
sites.Next time, please don't be so (repeatedly) parsimonious in
the provision ofinformation, if you expect/hope thatsomeone is
going to give their (free) time to help you out.
(grumble)=dn- Original Message -From:
"Zach Curtis" <[EMAIL PROTECTED]>To: "DL
Neil" <[EMAIL PROTECTED]>Cc:
<[EMAIL PROTECTED]>Sent:
23 January 2002 21:52Subject: RE: [PHP-DB] # of Records in
Table> The key field is the password field, which is also
the field that I would&g
RE: [PHP-DB] # of Records in Table
There are many columns of data in the table. The only column that I would like to extract a value from is the password field (this is the key as well). I do not have an AUTO_INCREMENT field. Although, I see how adding that field could be of use by using it with the SELECT MAX() as you mentioned. The last record is whatever the last record was inserted using INSERT INTO. To give you the overall picture of what I am trying to accomplish: 1) I am opening up a db table and searching for the password of the last record in the table 2) I then open a flat file and search for that password and grab the next record after that (as records are appended to the end of the flat file) and any other subsequent records added to the flat file 3) Write those new records to the db table In this scenario, the last record would be the last record from the flat file added to the db table. Another suggestion from [EMAIL PROTECTED] was to: Select your password field, and whatever other fields you need to Use -mysql_num_rows() to capture the number of rows returned -mysql_data_seek() to position pointer on last row (remember indexing starts at 0) -mysql_fetch_row() or mysql_fetch_array(), your choice, to return the data. This is done with one select statement, however all the passwords from the table have to be loaded into array (perhaps not the most efficient way? But better than what I had come up with.). I do generally find that the more brief I am in describing an issue, the more likely I am to get a reply. Then details can be given if needed, in further correspondences. I will give that AUTO_INCREMENT and SELECT MAX() a try as well. Zach -Original Message- From: DL Neil [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 23, 2002 3:27 PM To: Zach Curtis Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table Zach, We're going back and forth on this and getting no where... So far all you have informed us is that the table has one column, which contains a bunch of passwords (I also suggest that this is not really the case and there'll at least be some sort of userId field - but you haven't bothered to tell me/us that) The concept of "last" in relational terminology is ambiguous. Do you mean last entered, or do you mean the row with the field containing the highest value in the column - for example. Some people are used to the idea that there is also some 'phantom' rowId that counts/labels each row. In other file systems this might have been the case, but the physically last record in an RDBMS table-file may not conform to either of the "last" definitions mentioned above. There is no such 'highest' in an RDBMS unless you put it there - as mentioned by another correspondent, it's a good idea to use some sort of 'id' field in every table. This can be generated for you with the AUTO_INCREMENT feature. With appropriate design, eg first record has id=1 and the succeeding records have id-s with ascending values, then you can use SELECT MAX() against the 'id' or possibly against the AUTO_INCREMENT feature. These commands are well documented - RTFM. Many tutorials with plenty of examples of authentication techniques exist on the PHP/MySQL web sites. Next time, please don't be so (repeatedly) parsimonious in the provision of information, if you expect/hope that someone is going to give their (free) time to help you out. (grumble) =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: 23 January 2002 21:52 Subject: RE: [PHP-DB] # of Records in Table > The key field is the password field, which is also the field that I would > like to retrieve for that last record. > > > Zach > > -Original Message----- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 2:08 PM > To: Zach Curtis > Cc: [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > How can this "last record" be identified? Is there a key field or something > similar? > > Again: We might need to see the table definition to answer this. > > Please advise, > =dn > > > - Original Message - > From: "Zach Curtis" <[EMAIL PROTECTED]> > To: "DL Neil" <[EMAIL PROTECTED]> > Sent: 23 January 2002 20:49 > Subject: RE: [PHP-DB] # of Records in Table > > > > The last record should be whatever the last record is in the table. For > > example, if there are 1000 records in the table which COUNT(*) will tell > me, > > how can I get the password for record 1000. The only thing I can do that > > would probably work is two query statements, one selecting COUNT(*) and > the > > other selecting "password". W
RE: [PHP-DB] # of Records in Table
By "last record", do you mean the last was inserted into the database? If so, look to MYSQL's auto_increment and last_insert_id(). > -Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 2:08 PM > To: Zach Curtis > Cc: [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > How can this "last record" be identified? Is there a key field or something > similar? > > Again: We might need to see the table definition to answer this. > > Please advise, > =dn > > > - Original Message - > From: "Zach Curtis" <[EMAIL PROTECTED]> > To: "DL Neil" <[EMAIL PROTECTED]> > Sent: 23 January 2002 20:49 > Subject: RE: [PHP-DB] # of Records in Table > > > > The last record should be whatever the last record is in the table. For > > example, if there are 1000 records in the table which COUNT(*) will tell > me, > > how can I get the password for record 1000. The only thing I can do that > > would probably work is two query statements, one selecting COUNT(*) and > the > > other selecting "password". What I don't like about this method is that I > > would have to retrieve all of the passwords into an array, which I would > > assume would be slow on larger tables. Ideally, I thought their would be a > > way to do this operation in one select statement. Any thoughts? > > > > > > Zach > > > > -Original Message- > > From: DL Neil [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, January 23, 2002 1:11 PM > > To: Zach Curtis; [EMAIL PROTECTED] > > Subject: Re: [PHP-DB] # of Records in Table > > > > > > Zach, > > > > > What syntax can I use to determine how many records are in a MySQL table > > and > > > then retrieve the value of the field "password" for the last record? I > > tried > > > using some combinations of COUNT(*) and LIMIT with no success. > > > > > > SELECT COUNT(*) will answer the first part. What did you try that lacked > > success? > > > > How do you define "last record"? We might need to see the table definition > > to answer this. > > > > Regards, > > =dn > > > > > > > > > > > > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
Zach, We're going back and forth on this and getting no where... So far all you have informed us is that the table has one column, which contains a bunch of passwords (I also suggest that this is not really the case and there'll at least be some sort of userId field - but you haven't bothered to tell me/us that) The concept of "last" in relational terminology is ambiguous. Do you mean last entered, or do you mean the row with the field containing the highest value in the column - for example. Some people are used to the idea that there is also some 'phantom' rowId that counts/labels each row. In other file systems this might have been the case, but the physically last record in an RDBMS table-file may not conform to either of the "last" definitions mentioned above. There is no such 'highest' in an RDBMS unless you put it there - as mentioned by another correspondent, it's a good idea to use some sort of 'id' field in every table. This can be generated for you with the AUTO_INCREMENT feature. With appropriate design, eg first record has id=1 and the succeeding records have id-s with ascending values, then you can use SELECT MAX() against the 'id' or possibly against the AUTO_INCREMENT feature. These commands are well documented - RTFM. Many tutorials with plenty of examples of authentication techniques exist on the PHP/MySQL web sites. Next time, please don't be so (repeatedly) parsimonious in the provision of information, if you expect/hope that someone is going to give their (free) time to help you out. (grumble) =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: 23 January 2002 21:52 Subject: RE: [PHP-DB] # of Records in Table > The key field is the password field, which is also the field that I would > like to retrieve for that last record. > > > Zach > > -Original Message----- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 2:08 PM > To: Zach Curtis > Cc: [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > How can this "last record" be identified? Is there a key field or something > similar? > > Again: We might need to see the table definition to answer this. > > Please advise, > =dn > > > - Original Message - > From: "Zach Curtis" <[EMAIL PROTECTED]> > To: "DL Neil" <[EMAIL PROTECTED]> > Sent: 23 January 2002 20:49 > Subject: RE: [PHP-DB] # of Records in Table > > > > The last record should be whatever the last record is in the table. For > > example, if there are 1000 records in the table which COUNT(*) will tell > me, > > how can I get the password for record 1000. The only thing I can do that > > would probably work is two query statements, one selecting COUNT(*) and > the > > other selecting "password". What I don't like about this method is that I > > would have to retrieve all of the passwords into an array, which I would > > assume would be slow on larger tables. Ideally, I thought their would be a > > way to do this operation in one select statement. Any thoughts? > > > > > > Zach > > > > -Original Message- > > From: DL Neil [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, January 23, 2002 1:11 PM > > To: Zach Curtis; [EMAIL PROTECTED] > > Subject: Re: [PHP-DB] # of Records in Table > > > > > > Zach, > > > > > What syntax can I use to determine how many records are in a MySQL table > > and > > > then retrieve the value of the field "password" for the last record? I > > tried > > > using some combinations of COUNT(*) and LIMIT with no success. > > > > > > SELECT COUNT(*) will answer the first part. What did you try that lacked > > success? > > > > How do you define "last record"? We might need to see the table definition > > to answer this. > > > > Regards, > > =dn > > > > > > > > > > > > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] # of Records in Table
Excellent. That is more efficient (one select statement) than what I was trying to do. Zach -Original Message- From: Miles Thompson [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 23, 2002 2:20 PM To: Zach Curtis; [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table Select your password field, and whatever other fields you need Use -mysql_num_rows() to capture the number of rows returned -mysql_data_seek() to position pointer on last row (remember indexing starts at 0) -mysql_fetch_row() or mysql_fetch_array(), your choice, to return the data. One select. One bit of relational theory I always ignore, but have come to appreciate as I gain experience, is the virtue of having a unique key on every table in a database. If that's a key I can rely on to steadily increase in value, so much the better. Hope this helps and gets you out of your fix - Miles Thompson At 01:52 PM 1/23/2002 -0700, Zach Curtis wrote: >The last record should be whatever the last record is in the table. For >example, if there are 1000 records in the table which COUNT(*) will tell me, >how can I get the password for record 1000. The only thing I can do that >would probably work is two query statements, one selecting COUNT(*) and the >other selecting "password". What I don't like about this method is that I >would have to retrieve all of the passwords into an array, which I would >assume would be slow on larger tables. Ideally, I thought their would be a >way to do this operation in one select statement. Any thoughts? > > >Zach > >-Original Message- >From: DL Neil [mailto:[EMAIL PROTECTED]] >Sent: Wednesday, January 23, 2002 1:11 PM >To: Zach Curtis; [EMAIL PROTECTED] >Subject: Re: [PHP-DB] # of Records in Table > > >Zach, > > > What syntax can I use to determine how many records are in a MySQL table >and > > then retrieve the value of the field "password" for the last record? I >tried > > using some combinations of COUNT(*) and LIMIT with no success. > > >SELECT COUNT(*) will answer the first part. What did you try that lacked >success? > >How do you define "last record"? We might need to see the table definition >to answer this. > >Regards, >=dn > > > > >-- >PHP Database Mailing List (http://www.php.net/) >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] >To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] # of Records in Table
The key field is the password field, which is also the field that I would like to retrieve for that last record. Zach -Original Message- From: DL Neil [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 23, 2002 2:08 PM To: Zach Curtis Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table Zach, How can this "last record" be identified? Is there a key field or something similar? Again: We might need to see the table definition to answer this. Please advise, =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Sent: 23 January 2002 20:49 Subject: RE: [PHP-DB] # of Records in Table > The last record should be whatever the last record is in the table. For > example, if there are 1000 records in the table which COUNT(*) will tell me, > how can I get the password for record 1000. The only thing I can do that > would probably work is two query statements, one selecting COUNT(*) and the > other selecting "password". What I don't like about this method is that I > would have to retrieve all of the passwords into an array, which I would > assume would be slow on larger tables. Ideally, I thought their would be a > way to do this operation in one select statement. Any thoughts? > > > Zach > > -Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 1:11 PM > To: Zach Curtis; [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > > What syntax can I use to determine how many records are in a MySQL table > and > > then retrieve the value of the field "password" for the last record? I > tried > > using some combinations of COUNT(*) and LIMIT with no success. > > > SELECT COUNT(*) will answer the first part. What did you try that lacked > success? > > How do you define "last record"? We might need to see the table definition > to answer this. > > Regards, > =dn > > > > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
Select your password field, and whatever other fields you need Use -mysql_num_rows() to capture the number of rows returned -mysql_data_seek() to position pointer on last row (remember indexing starts at 0) -mysql_fetch_row() or mysql_fetch_array(), your choice, to return the data. One select. One bit of relational theory I always ignore, but have come to appreciate as I gain experience, is the virtue of having a unique key on every table in a database. If that's a key I can rely on to steadily increase in value, so much the better. Hope this helps and gets you out of your fix - Miles Thompson At 01:52 PM 1/23/2002 -0700, Zach Curtis wrote: >The last record should be whatever the last record is in the table. For >example, if there are 1000 records in the table which COUNT(*) will tell me, >how can I get the password for record 1000. The only thing I can do that >would probably work is two query statements, one selecting COUNT(*) and the >other selecting "password". What I don't like about this method is that I >would have to retrieve all of the passwords into an array, which I would >assume would be slow on larger tables. Ideally, I thought their would be a >way to do this operation in one select statement. Any thoughts? > > >Zach > >-Original Message- >From: DL Neil [mailto:[EMAIL PROTECTED]] >Sent: Wednesday, January 23, 2002 1:11 PM >To: Zach Curtis; [EMAIL PROTECTED] >Subject: Re: [PHP-DB] # of Records in Table > > >Zach, > > > What syntax can I use to determine how many records are in a MySQL table >and > > then retrieve the value of the field "password" for the last record? I >tried > > using some combinations of COUNT(*) and LIMIT with no success. > > >SELECT COUNT(*) will answer the first part. What did you try that lacked >success? > >How do you define "last record"? We might need to see the table definition >to answer this. > >Regards, >=dn > > > > >-- >PHP Database Mailing List (http://www.php.net/) >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] >To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP-DB] # of Records in Table
SELECT * FROM mytable ORDER BY fielda DESC LIMIT 1; - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Sent: 23 January 2002 20:49 Subject: RE: [PHP-DB] # of Records in Table > The last record should be whatever the last record is in the table. For > example, if there are 1000 records in the table which COUNT(*) will tell me, > how can I get the password for record 1000. The only thing I can do that > would probably work is two query statements, one selecting COUNT(*) and the > other selecting "password". What I don't like about this method is that I > would have to retrieve all of the passwords into an array, which I would > assume would be slow on larger tables. Ideally, I thought their would be a > way to do this operation in one select statement. Any thoughts? > > > Zach > > -Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 1:11 PM > To: Zach Curtis; [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > > What syntax can I use to determine how many records are in a MySQL table > and > > then retrieve the value of the field "password" for the last record? I > tried > > using some combinations of COUNT(*) and LIMIT with no success. > > > SELECT COUNT(*) will answer the first part. What did you try that lacked > success? > > How do you define "last record"? We might need to see the table definition > to answer this. > > Regards, > =dn > > > > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
Zach, How can this "last record" be identified? Is there a key field or something similar? Again: We might need to see the table definition to answer this. Please advise, =dn - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: "DL Neil" <[EMAIL PROTECTED]> Sent: 23 January 2002 20:49 Subject: RE: [PHP-DB] # of Records in Table > The last record should be whatever the last record is in the table. For > example, if there are 1000 records in the table which COUNT(*) will tell me, > how can I get the password for record 1000. The only thing I can do that > would probably work is two query statements, one selecting COUNT(*) and the > other selecting "password". What I don't like about this method is that I > would have to retrieve all of the passwords into an array, which I would > assume would be slow on larger tables. Ideally, I thought their would be a > way to do this operation in one select statement. Any thoughts? > > > Zach > > -Original Message- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 23, 2002 1:11 PM > To: Zach Curtis; [EMAIL PROTECTED] > Subject: Re: [PHP-DB] # of Records in Table > > > Zach, > > > What syntax can I use to determine how many records are in a MySQL table > and > > then retrieve the value of the field "password" for the last record? I > tried > > using some combinations of COUNT(*) and LIMIT with no success. > > > SELECT COUNT(*) will answer the first part. What did you try that lacked > success? > > How do you define "last record"? We might need to see the table definition > to answer this. > > Regards, > =dn > > > > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
The last record should be whatever the last record is in the table. For example, if there are 1000 records in the table which COUNT(*) will tell me, how can I get the password for record 1000. The only thing I can do that would probably work is two query statements, one selecting COUNT(*) and the other selecting "password". What I don't like about this method is that I would have to retrieve all of the passwords into an array, which I would assume would be slow on larger tables. Ideally, I thought their would be a way to do this operation in one select statement. Any thoughts? Zach -Original Message- From: DL Neil [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 23, 2002 1:11 PM To: Zach Curtis; [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table Zach, > What syntax can I use to determine how many records are in a MySQL table and > then retrieve the value of the field "password" for the last record? I tried > using some combinations of COUNT(*) and LIMIT with no success. SELECT COUNT(*) will answer the first part. What did you try that lacked success? How do you define "last record"? We might need to see the table definition to answer this. Regards, =dn -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
It does not. However, I could easily add this in if you have a suggestion that would work. Ideally, I thought their would be a way to do this operation in one select statement. Any thoughts? Zach -Original Message- From: Jim Lucas [php] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 23, 2002 1:10 PM To: Zach Curtis; [EMAIL PROTECTED] Subject: Re: [PHP-DB] # of Records in Table does the table have an autoincrement column? Jim Lucas - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 23, 2002 10:27 AM Subject: [PHP-DB] # of Records in Table > What syntax can I use to determine how many records are in a MySQL table and > then retrieve the value of the field "password" for the last record? I tried > using some combinations of COUNT(*) and LIMIT with no success. > > Thanks. > > > Zach Curtis > POPULUS > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
does the table have an autoincrement column? Jim Lucas - Original Message - From: "Zach Curtis" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 23, 2002 10:27 AM Subject: [PHP-DB] # of Records in Table > What syntax can I use to determine how many records are in a MySQL table and > then retrieve the value of the field "password" for the last record? I tried > using some combinations of COUNT(*) and LIMIT with no success. > > Thanks. > > > Zach Curtis > POPULUS > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > > -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP-DB] # of Records in Table
Zach, > What syntax can I use to determine how many records are in a MySQL table and > then retrieve the value of the field "password" for the last record? I tried > using some combinations of COUNT(*) and LIMIT with no success. SELECT COUNT(*) will answer the first part. What did you try that lacked success? How do you define "last record"? We might need to see the table definition to answer this. Regards, =dn -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
