On 8/22/06, Alvaro Herrera <alvherre@xxxxxxxxxxxxxxxxx> wrote:
Ulrich Habel wrote: > Hello all, > had an idea of optimizing a query that may work generally. > > In case a 'column' is indexed, following two alterations could be done > I think: > > A) > > select ... where column ~ '^Foo' --> Seq Scan This is not true. You can make this query use an index if you create it with opclass varchar_pattern_ops or text_pattern_ops, as appropiate. Thus you don't need any hack here.
And in the case of more general expression, like: select ... where column ~ 'something'; Is there a way to optimise this ? (in the case where 'something' is not a word, but a part of a word) -- Thomas SAMSON
