Port Bug Report: Previous Bug Report My Fault (i.e. not a bug)

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Thomas R. Dean
Your email address : dean(at)legasys(dot)on(dot)ca

Category : runtime: back-end: SQL
Severity : non-critical

Summary: Previous Bug Report My Fault (i.e. not a bug)

System Configuration
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Operating System : Linux 2.0.36 ELF

PostgreSQL version : 6.5

Compiler used : gcc 2.7.2.3

Hardware:
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Pentium II/256MB/Redhat 5.1 + patches

Versions of other tools:
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Problem Description:
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My previous entry on friday was the result of a single NULL
entry in one of the rows of the second table. However, I
would like to make the case for unions in subselects (BUG#1).
EXCEPT requires that the query and the subselect have the
same number of colums, while not in uses a subselect
with a single column. Was there any particular reason
it was removed (it was in 6.4.2)?

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Test Case:
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Solution:
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