Re: strange behvaviour in join? BUG in 7.02?

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
PGP: 1024R/32B8FAA1: 97 EA 1D 47 72 3F 28 47  6B 7E 39 CC 56 E4 C1 47
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C
                 ========================================
     "But thanks be to God, which giveth us the victory
      through our Lord Jesus Christ."
                              I Corinthians 15:57