7. Re: [NF] MySQL IFNULL() Question (Ken Dibble)
Yeah. The idea is to have People in the system only once, since the same
person can be an Artist (designated as such for a Performance, like when
you go to see Bonnie Raitt--she's got a Band too, but it's not The Bonnie
Raitt Band, it's just
Do any of these help? http://www.databaseanswers.org/data_models/
There's certainly a lot of food for thought there. Thanks very much!
Ken
www.stic-cil.org
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Similar to the directory problem, sometimes you need to convert a type
of data into a more abstract element.
Well, that's what I thought I was doing with my compound key of arttype and
artid. They behave as though there is a coordinates table, except that
table doesn't really exist.
Derek Kalweit wrote:
Try TEXT TO artfield TEXTMERGE NOSHOW PRETEXT 2
The PRETEXT value was added to trim out the leading spaces or
tabs(2=tabs) which will make the string look good in code(properly
indented), but be compact when you send it to the server.
And thus will be better because
Try TEXT TO artfield TEXTMERGE NOSHOW PRETEXT 2
The PRETEXT value was added to trim out the leading spaces or
tabs(2=tabs) which will make the string look good in code(properly
indented), but be compact when you send it to the server.
And thus will be better because it's not as many
It returns actual values for artist that my
query returned as null. Can you tell me why that is?
The WHERE clause for each of the two selects filters out only those
records that match either Person or Band so you're not getting any
extra records with NULLs.
Right. But (he said sheepishly)
On 3/6/07, Ken Dibble [EMAIL PROTECTED] wrote:
Right. But (he said sheepishly) my tables had actual data in them that
should have been returned in the artist field for some performances;
instead my query returned nulls in some cases.
No need to be sheepish. This stuff is hard. I suspect you
At 03:57 PM 3/6/07, you wrote:
On 3/6/07, Ken Dibble [EMAIL PROTECTED] wrote:
I suspect you have a subtle data design problem, one iirc Tamar once
presented as parents of unrelated siblings - your Perfs table has an id
that you are
joining both to a PK in the Person table and a PK in the
Yeah. The idea is to have People in the system only once, since the same
person can be an Artist (designated as such for a Performance, like when
you go to see Bonnie Raitt--she's got a Band too, but it's not The Bonnie
snip
This sounds like a great problem for a database design class.
On 3/4/07, Ken Dibble [EMAIL PROTECTED] wrote:
I'm trying to substitute an empty string when a derived field returns None
(null).
Any suggestions would be appreciated. Thanks.
You might not like my suggestion ;). If I understand what you're
doing, you're trying to assemble a list of records
Hi Ken
I like Ted Roche's approach, but have you tried CAST()?
BTW, here's a way to make your query more readable which may help you
with future queries.
TEXT TO artfield TEXTMERGE NOSHOW
(SELECT ICASE(musPerfs.arttype == P,
ALLTRIM(musPeople.firstname) + +
I'm trying to substitute an empty string when a derived field returns None
(null).
Any suggestions would be appreciated. Thanks.
You might not like my suggestion ;). If I understand what you're
doing, you're trying to assemble a list of records and the performer
from the Songs and Perfs
Actually, I like it a lot. It returns actual values for artist that my
query returned as null. Can you tell me why that is? (I know it's not the
field truncating thing; I modified my original query with a PADL() and
still got those nulls.)
I meant, PADR().
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I like Ted Roche's approach, but have you tried CAST()?
I hadn't. Ted's query runs faster than mine, though, and, apparently, it's
more accurate (returns actual values for artist in places where my query
returned nulls). I don't know why that is, though, and I also don't know
why, separate
I'm trying to substitute an empty string when a derived field returns None
(null).
In VFP 9 I can do it like this:
artfield = '(SELECT ICASE(musPerfs.arttype == P, ' ;
+ 'ALLTRIM(musPeople.firstname) +
+ ALLTRIM(musPeople.lastname), ' ;
+ 'musPerfs.arttype == B, '
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