Hi all.
It's not clear to me how composite values are used in conditions (WHERE/CHECK).
In my case I have something like this:
-- begin snippet
CREATE TABLE test_tab (
col1 timestamp not null,
col2 int8 not null,
col3 text not null
);
CREATE INDEX i_test_tab_col1 ON test_tab( col1 );
SELECT *
FROM test_tab
WHERE (date_trunc('week',col1),col2,col3)=('val1'::timestamp,val2,'val3')
;
-- end snippet
For a number of reasons I cannot split the the WHERE condition in the
"usual" AND-list.
My questions are:
Can the i_test_tab_col1 INDEX be taken into account from the query planner?
What if I define a functional index on col1?
Does the same apply to TABLE-level CHECK conditions?
Thanks in advance.
--
Vincenzo Romano
NotOrAnd Information Technologies
NON QVIETIS MARIBVS NAVTA PERITVS
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