Eugene Wang wrote:
> Unique Constraint and Unique Index should be the same in this single-column
> case, right?
>
> Because, according to CONSTRAINT page in Postgres Documentation, Unique
> Constraint on single column is realized as Unique B-TREE index.
>
> I have just realized that it is still a btree index, but I think this
> example is not exactly a regular btree example. At least I will put the
> example as: CREATE INDEX title_idx ON films USING BTREE(title);
Yeah, I see no point for having UNIQUE in that example.
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Álvaro Herrera https://www.2ndQuadrant.com/
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