Conditional index in PostgreSQL

Question

I know from using Oracle that conditonal index with CASE statement is possible. But is it possible in PostgreSQL? For example index is following:

CREATE INDEX IX_INDEXNAME ON SOME_TABLE (
     CASE 
        WHEN COLUMN1 = 0 AND COLUMN2 = 'value' THEN SOME1_ID
        ELSE SOME2_ID
     END);

This is already modified version for PostgreSQL, because Oracle case statement is different from Postgres. If this is possbile how do I do that? Or if this is not possible, is there another way to realize it?

Doesn't the create index work that you have? If not, was is the error? — user330315
– user330315, Commented Jan 19, 2015 at 19:29

user330315 · Accepted Answer · 2015-01-19 19:34:23Z

2

You need to enclose the CASE expression in parentheses:

CREATE INDEX IX_INDEXNAME ON SOME_TABLE (
     (CASE 
        WHEN COLUMN1 = 0 AND COLUMN2 = 'value' THEN SOME1_ID
        ELSE SOME2_ID
     END) );

answered Jan 19, 2015 at 19:34

user330315

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