How to get details of constraints associated with Data in SQLite3.
Ex : I want to find out DEFAULT constraints value associated with data.
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Vijay Khurdiya wrote:
> How to get details of constraints associated with Data in SQLite3.
There is no API to get individual properties; you have to look up the
original SQL statement:
SELECT sql FROM sqlite_master WHERE type = 'table' AND name = 'MyTable'
> This e-mail and any files
If you have any issues with the current code, please report them via this
mailing
list (and/or by creating a ticket on "https://system.data.sqlite.org/;)
prior to
next Monday, July 8th.
The support for implementing virtual tables in managed code is completely
new and
merits special attention.
I wish.
I need to remove those records from another table as well. That's why I
need to retrieve playerid first.
So once again: will the delete affect the outer looping SQLite statement?
I hate to be the one asking the obvious questions, but why are you not using a trigger or or a foreign key
Is there a function (or method), e.g., row(), to return the sequence number
of the selected row? This is not the same as ROWID. row() should give a
sequence number always starting from 1 up the to the number of rows returned
by the view/select etc.
If not, then please add to the wish list.
I can't wait to try
order by row_number desc
On 1 Jul 2013, at 10:33, Tony Papadimitriou wrote:
> Is there a function (or method), e.g., row(), to return the sequence number
> of the selected row? This is not the same as ROWID. row() should give a
> sequence number
I can't imagine the usefulness of this. The SQLite will have to run a query to find it, same as you need to, consider some standard
sqlite code:
sqlite prepare
n=0
while sqlite_next=SQLITE_OK do {
// do something with data
inc(n)
}
The physical index of the row inside the query will always
This would not be something you would sort by. It should be assigned a
value only during final 'display' of the query after all 'sorts' of
operations are done with.
-Original Message-
From: Alex Bowden
Sent: Monday, July 01, 2013 12:46 PM
To: General Discussion of SQLite Database
I can't wait to try
order by row_number desc
LOL - But done already:
PRAGMA reverse_unordered_selects = 1;
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> This would not be something you would sort by.
And what if I do?
> It should be assigned a value only during final 'display' of the query after
> all 'sorts' of operations are done with.
Oh great. So the user is supposed to understand the implementation, in order
to understand what the
I also needed this for some special update queries.
Without many details, it was some kind of "insert into xxx select
, otherfields from source order by ".
For this case there is a workaround, selecting first into a temporary
table with auto generated rowid and using it afterwards for
Hi,
Where the "row number in the answer set" does come in useful (or at least
where I've used it a number of itmes) is when populating a table with the
results of a select and including this value as another column in that
table.
"build a table with the top 10 selling items over the last week"
Please! Just because you can select something doesn't mean you have to be
able to sort by it. Can you sort by *
(select * by table sort by *)? So, why make it sound like I don't know what
I'm talking about?
-Original Message-
From: Alex Bowden
Sent: Monday, July 01, 2013 2:07 PM
Thanks! (At least some understand what I mean!)
And people giving examples of how it can be done in C (or Python, for me) or
whatever language miss the point. We're not talking how it can be
programmatically. This is easy!!! How does one do it via pure SQL is the
real question.
As for
For this application I would suggest:
DROP TABLE IF EXISTS query_results;
CREATE TEMP TABLE query_results (...);
INSERT INTO query_results
SELECT
ORDER BY
LIMIT ;
SELECT rowid,* from query_results;
DROP TABLE IF EXISTS query_results;
SQLite implicitly assigns numerical ascending rowids to a
On 1 Jul 2013, at 10:33am, Tony Papadimitriou wrote:
> Is there a function (or method), e.g., row(), to return the sequence number
> of the selected row? This is not the same as ROWID. row() should give a
> sequence number always starting from 1 up the to the number of rows
On Mon, 1 Jul 2013 07:23:54 +, Vijay Khurdiya
wrote:
>How to get details of constraints associated with Data in SQLite3.
>
>Ex : I want to find out DEFAULT constraints value associated with data.
Some of that info is available in the results of
PRAGMA
Then this register value is exactly the needed result.
There is also the other syntax, "limit n, m"; you have to skip somehow
"m" rows.
Gabriel
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Simon,
As I wrote it's easy to do when you control the loop.
Sometimes there is either no explicit loop (direct sql, no programming
code) or the loop is out of your reach (3rd party library).
Gabriel
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The problem is
a) you must have a limit clause for the register to even be tallied
b) the register is not part of the result set
c) it would be a very incompatible change to SQL syntax
d) there are other ways of achieving the same result, either in the caller or
in a user written function
I recently updated our SQLite source to SQLite source distribution 3.7.17.
Since then, we get assertions when running one of our larger queries. I have
stripped down the query to a bare minimum query that produces the same
assertion:
The following rather simple SELECT query gives me an
On 1 Jul 2013, at 2:00pm, Gabriel Corneanu wrote:
> As I wrote it's easy to do when you control the loop.
> Sometimes there is either no explicit loop (direct sql, no programming code)
> or the loop is out of your reach (3rd party library).
Sorry, I posted that
Hi,
My opinion is a little different:
a) of course the compiler needs to change the query program (only if
"nrow" is requested/used)
b) I don't know the internals, but I just can't believe that such a
value could not be exported somehow
c) I understand it would be non-standard; however there
Hi Simon,
No problem, but I don't understand what has this to do with multi -
processing / users?? (the query program has a lock on the table anyway).
The counter can be either reused (see the other "LIMIT" discussion) or
it needs a different implementation.
As I don't think that the
On 1 Jul 2013, at 2:54pm, Gabriel Corneanu wrote:
> While I agree non-standard features should be kept to minimum possible, I
> needed this so often that I simply think there is a larger potential benefit.
> Another example: I don't do web design, but I remember some
> Please! Just because you can select something doesn't mean you have to be
> able to sort by it.
There are a small number of exceptions, each of which is a bodge.
But some bodges are worth the impact.
> Can you sort by *
* is a very useful and largely harmless bodge.
There is
I agree with you completely! It has to be relatively simple to implement.
And certainly it adds a very important missing functionality (for those who
can see it, that is).
Some kind of internal cursor has to iterate to return rows to the user after
the query is completely executed. This can
OK, you don't agree. Your opinion! (That doesn't make you right, though!)
I'm sure there will be a SQL engine somewhere that will do it for you.
We're talking about SQLite here, aren't we? If some other database can do
it, then you should also consider that it may also be able to do what
> OK, you don't agree. Your opinion! (That doesn't make you right, though!)
If you approach the government france and explain that you're not really very
good at French, but if they made the following list of Chinese language
inclusions into French, then it would make it easier for you to
SQLite Expert (Windows) is good and I've been using it for the last 2
years but unfortunately it only does (Windows).
Although, it also runs good in WINE on Linux.
I've recently started using Valentina Studio (Linux/Windows/Mac) because
I need to also run on native Linux, and if I get rich I'll
On Mon, Jul 1, 2013 at 9:20 AM, Jens Miltner wrote:
> I recently updated our SQLite source to SQLite source distribution 3.7.17.
> Since then, we get assertions when running one of our larger queries. I
> have stripped down the query to a bare minimum query that produces the same
>
rownumber = 0
do while ThereAreRows:
sqlite3_step ...
rownumber += 1
...
pretty simple eh?
> -Original Message-
> From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-
> boun...@sqlite.org] On Behalf Of Tony Papadimitriou
> Sent: Monday, 1 July, 2013 03:33
> To: General
Yes, you can sort by *
> -Original Message-
> From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-
> boun...@sqlite.org] On Behalf Of Tony Papadimitriou
> Sent: Monday, 1 July, 2013 05:23
> To: General Discussion of SQLite Database
> Subject: Re: [sqlite] Is there a way to return
On Sun, 30 Jun 2013 23:27:23 -0400
Igor Tandetnik wrote:
> On 6/30/2013 11:13 PM, Igor Korot wrote:
> > Well I will use another statement variable as in the sample code.
> > My questions was: if I call delete on the record that was just
> > retrieved in another query will
On Mon, 1 Jul 2013 14:22:53 +0300
"Tony Papadimitriou" wrote:
> Just because you can select something doesn't mean you have to be
> able to sort by it.
Yes, it does.
> Can you sort by * (select * by table sort by *)?
You have confused syntax with semantics.
"select *"
On Mon, 01 Jul 2013 13:10:59 +0200
Gabriel Corneanu wrote:
> I also needed this for some special update queries.
> Without many details, it was some kind of "insert into xxx select
> , otherfields from source order by ".
> For this case there is a workaround,
On 7/1/2013 10:33 PM, James K. Lowden wrote:
On Sun, 30 Jun 2013 23:27:23 -0400
Igor Tandetnik wrote:
If you change data that a live SELECT statement is iterating over,
the outcome is unpredictable. It may appear to work, it may skip
rows, it may return some rows more than
On Mon, 01 Jul 2013 23:00:27 -0400
Igor Tandetnik wrote:
> On 7/1/2013 10:33 PM, James K. Lowden wrote:
> > Igor Tandetnik wrote:
> >> If you change data that a live SELECT statement is iterating over,
> >> the outcome is unpredictable. It may appear to
On 7/1/2013 11:30 PM, James K. Lowden wrote:
Restricting ourselves to one process, I can think of two ways that
might go:
1. With two connections, one connection or the other will wait.
SELECT will return 0 or 10 rows.
Yes, between two connection, normal transaction isolation rules apply,
Bravo Alex !!
From: sqlite-users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org] on
behalf of Alex Bowden [a...@designlifecycle.com]
Sent: Monday, July 01, 2013 12:34 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] Is there a way
On Mon, Jul 01, 2013 at 10:52:20PM -0400, James K. Lowden scratched on the wall:
> "select *" is shorthand for "all columns". You'll note that what's
> returned isn't some kind of special '*' column, but all columns. The
> order in which the columns are returned isn't meaningful because the
>
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