Radoslaw Stachowiak wrote:
>I have PSQL 7.02
>
>classic join on Two tables:
>
>select l.id from linia l,lk_strefa2linia lk
>where l.id = lk.fk_linia and lk.fk_strefa=5;
>
>gives correct linia.ids.
>
>but
>select linia.id from linia l,lk_strefa2linia lk
>where l.id = lk.fk_linia and lk.fk_strefa=5;
>
>(the only difference is second word: linia.id instead l.id)
>will give totaly different results).
You are actually doing a 3-way join, with linia included twice.
It is implicitly included a second time when a column is referenced
from it without the alias.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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