On 02/08/2016 11:05 AM, Johannes wrote:
Hi,
is there a best practice to share data between two select statements?
A join:
http://www.postgresql.org/docs/9.4/interactive/sql-select.html
Search for:
join_type
Imaging following situation: I want to receive two result sets from two
tables, referring to a specific id from table t0 AND I try not to query
for that specific id a second time.
Table t0 returns 1 row and table t1 returns multiple rows.
begin;
select id, col1, col2, ... from t0 where id = (select max(id) from t0
where col1 = value1 and col2 = value2 and ...);
select col1 from t1 where t0_id = (select max(id) from t0 where col1 =
value1 and col2 = value2 and ...);
commit;
Based on rough guess of the above, without seeing actual table schemas:
select id, t0.col1, t1.col1, col2, ... from t0 JOIN t1 ON t0.id =
t1.t0_id where id = (select max(id) from t0 where col1 = value1 and col2
= value2 and ...);
Best regards Johannes
--
Adrian Klaver
adrian.kla...@aklaver.com
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