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How to create n sql columns dynamically
Message
From
03/07/2001 05:39:43
 
 
To
02/07/2001 18:18:27
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Miscellaneous
Thread ID:
00526094
Message ID:
00526183
Views:
23
Hi!

You can do this by using & and SELECT statements. Populate a string variable with the query like following:

lcstr=

select a1.id, a1.time as m1, 0 as m2, 0 as m3, ..... from MyTimes a1 into cursor tempcursor
union all
select a2.id, 0 as m1, a2.time as m2, 0 as m3, ..... from MyTimes a2
union all
select a3.id, 0 as m1, 0 as m2, a3.time as m3, ..... from MyTimes a3
.....

&lcstr

Next query is:

select id, max(m1), max(m2), max(m3), ..... from tempcursor group by id

Build it in the string and run it too using &. Instead of max() you can use sum() in case of negative values, it is slower, however.

Pretty pure crosstab, but in simple case it is just a 2 queries...

HTH.

>Hi readers!,
> Is it possible to create n sql columns for an specific field table, let me explain a little bit more:
>
> I have the next table:
> field -----value
> id ---- 1000
> time ---- 0700
> id ---- 1000
> time ---- 1700
> id ---- 1400
> ...and so on
>
>and I need the syntax for sql command that produces the next result set:
>
> id ------ m1 --- m2 --- m3 ... mn
> 1000 -- 0700 -- 1400 -- 1700 ...
>
>Best Regards
>Martin Alcaraz
Vlad Grynchyshyn, Project Manager, MCP
vgryn@yahoo.com
ICQ #10709245
The professional level of programmer could be determined by level of stupidity of his/her bugs

It is not appropriate to say that question is "foolish". There could be only foolish answers. Everybody passed period of time when knows nothing about something.
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