Re: immutable functions vs. join for lookups ?

* Tom Lane  wrote:


> Yeah, I was actually thinking about a two-step process: inline the
> function to produce somethig equivalent to a handwritten scalar
> sub-SELECT, and then try to convert sub-SELECTs into joins.

... back to my original question ... 

What kind of query should I use ?
Is a join better than a function ? 


cu
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