Laurent Martelli wrote:

"scott" == scott marlowe <[EMAIL PROTECTED]> writes:


scott> Note here:

  scott> Merge Join (cost=1788.68..4735.71 rows=1 width=85) (actual
  scott> time=597.540..1340.526 rows=20153 loops=1) Merge Cond:
  scott> ("outer".id = "inner".id)

  scott> This estimate is WAY off.  Are both of those fields indexed
  scott> and analyzed?  Have you tried upping the statistics target on
  scott> those two fields?  I assume they are compatible types.

Should I understand that a join on incompatible types (such as integer
and varchar) may lead to bad performances ?

Conversely, you should enforce strict type compatibility in comparisons for getting any good plans..:-)


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