Re: [firebird-support] VIEW optimization

2016. 04. 07. 18:48 keltezéssel, 'Mark Rotteveel' mark@lawinegevaar.nl
[firebird-support] írta:
> Why wouldn't it be necessary, this is an inner join, so the joined table
> needs to be evaluated if the matches row is present.
>

> SELECT RDB$FIELD_NAME FROM VIEW1

SELECT RDB$FIELD_NAME FROM RDB$RELATION_FIELDS

For me the two SELECT is equal. Is not? I don't understand why the JOIN
is in the PLAN when not needed for the result. My original problem is...
I have a complex SELECT and build up it at runtime in my application
include only the needed fields, JOINs in it. If create a VIEW from the
whole SELECT all JOIN etc executed even if only a single field needed
which can available without any JOIN or other thing.

Gabor


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