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3 Commits

Author SHA1 Message Date
drh 562528c480 Do all WHERE clauses tests, even if an index is used for lookup so that 
we know the test cannot be FALSE.  The test might end up being NULL in which
case it would need to be treated as false.  Ticket #461. (CVS 1103)

FossilOrigin-Name: 5aea81488b2d3bcdc009ccf0f0ffcda046e38d79
 2003-09-27 00:41:27 +00:00
drh 1288c9561d Multiplying NULL by zero gives NULL, not zero. I misread the test data 
and coded it wrong.  This check-in fixes the problem. (CVS 601)

FossilOrigin-Name: df9cc852ad02dbec5558d3915a0303f7e7b79b2b
 2002-06-01 21:41:10 +00:00
drh f570f011eb Refinements to NULL processing: NULLs are indistinct for DISTINCT and UNION. 
Multiplying a NULL by zero yields zero. In a CASE expression, a NULL comparison
is considered false, not NULL.  With these changes, NULLs in SQLite now work
the same as in PostgreSQL and in Oracle. (CVS 600)

FossilOrigin-Name: da61aa1d238539dff9c43fd9f464d311e28d669f
 2002-05-31 15:51:25 +00:00