On Wed, Oct 12, 2005 at 22:24:48 +0200,
peter pilsl <[EMAIL PROTECTED]> wrote:
>
> knowledge=# select x,count(case when id<5 then 't' else null end) from
> test2 group by x;
> x | count
> ---+---
> e | 1 <- thats the result I want !!!
> b | 1
> c | 1
> d |
0200
Subject: Re: [GENERAL] count( only if true)
> Martín Marqués wrote:
> >
> > I'm not sure what exactly it is you want, but check this:
> >
> > SELECT count(*) FROM tab WHERE expresion
> >
> > There you get a count of tuples that satisfy the expresio
Martín Marqués wrote:
I'm not sure what exactly it is you want, but check this:
SELECT count(*) FROM tab WHERE expresion
There you get a count of tuples that satisfy the expresion. What NULL values
are you talking about? Can you hand an example?
thnx.
# select * from test2;
x | id
---
El Mié 12 Oct 2005 15:42, peter pilsl escribió:
> the count-aggreate counts every expression that does not evaluate to null.
>
> I would like to have a count that counts all values that are true.
>
> Do I really need to make a count( case when expression then 't' else
> null) to implement this?
I'
am 12.10.2005, um 20:42:02 +0200 mailte peter pilsl folgendes:
>
> the count-aggreate counts every expression that does not evaluate to null.
>
> I would like to have a count that counts all values that are true.
>
> Do I really need to make a count( case when expression then 't' else null)
>
the count-aggreate counts every expression that does not evaluate to null.
I would like to have a count that counts all values that are true.
Do I really need to make a count( case when expression then 't' else
null) to implement this?
thnx,
peter
--
mag. peter pilsl
goldfisch.at
IT-manage
