Should I specify both INDEX and UNIQUE INDEX?
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Matt Huggins
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Published on 2010-12-25T21:07:25Z
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2010/12/27
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On one of my PostgreSQL tables, I have a set of two fields that will be defined as being unique in the table, but will also both be used together when selecting data. Given this, do I only need to define a UNIQUE INDEX, or should I specify an INDEX in addition to the UNIQUE INDEX?
This?
CREATE UNIQUE INDEX mytable_col1_col2_idx ON mytable (col1, col2);
Or this?
CREATE UNIQUE INDEX mytable_col1_col2_uidx ON mytable (col1, col2);
CREATE INDEX mytable_col1_col2_idx ON mytable (col1, col2);
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