I have a strange but reproducible problem where a query does not seem to
return the same results.
esp=# select 1::int4, * from data1.po_line_file
esp-# where pol_po_no = '00000002' and
esp-# (pol_po_no = '00000002' and pol_po_rel_no = 0) and
esp-# (pol_po_no = '00000002' and pol_po_rel_no = 0 and
pol_item_no = '1570')
esp-# limit 1 ;
[fields omitted]
(0 rows)
esp=# select 1::int4, * from data1.po_line_file
esp-# where --pol_po_no = '00000002' and
esp-# --(pol_po_no = '00000002' and pol_po_rel_no = 0) and
esp-# (pol_po_no = '00000002' and pol_po_rel_no = 0 and
pol_item_no = '1570')
esp-# limit 1 ;
[fields omitted, note commented redundant clauses]
(1 row)
The obviously silly Boolean clause here was sql that was generated by a
driver. I recoded the driver to make more intelligent sql and now the
problem is gone, at least from my application. Note that the same query
form but with different tables/fields works correctly 99.99999% of the
time, just not this time...I'm just curious as to how two seemingly
equivalent statements could produce different results...perhpaps I
missed something?
Merlin
