Lukasz Brodziak wrote:
> Hello,
>
> I know the question may appear lame but I have problem with a SELECT
> statement for a report. I have two separate statements:
> SELECT t1.col1, t1.col2, SUM(t2.end_date::DATE - t2.start_date::DATE)
> from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
> t3.col4 = t1.col4;
>
> SELECT (Now()::DATE - t2.start_date::DATE) AS days
> from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
> t3.col4 = t1.col4 and t2.end_date is null;
>
> What I need is to have both statements' results presented in one table
> which has 4 columns (t1.col1, t1.col2, "SUM", days). The tables used
> are the same in both statements.
It is not clear how these two queries should be joined; but you want to
use something like this...
SELECT sql1.col1, sql1.col2, sql1.sum, sql2.days from (
SELECT t1.col3, t1.col4, t1.col1, t1.col2,
SUM(t2.end_date::DATE - t2.start_date::DATE) as sum
from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
t3.col4 = t1.col4
) sql1 left join (
SELECT t1.col3, t1.col4, t1.col1, t1.col2,
(Now()::DATE - t2.start_date::DATE) AS days
from table1 t1, table2 t2, table3 t3 WHERE t1.col3 = t2.col3 and
t3.col4 = t1.col4 and t2.end_date is null
) sql2 on sql1.col3 = sql2.col3 and sql1.col4 = sql2.col4
Frank
