NULLIF topic in reference manual should explain NULLIF
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Key: DERBY-5557
URL: https://issues.apache.org/jira/browse/DERBY-5557
Project: Derby
Issue Type: Improvement
Components: Documentation
Affects Versions: 10.8.2.2
Reporter: Knut Anders Hatlen
The section describing NULLIF in the reference manual is a bit cryptic.
http://db.apache.org/derby/docs/10.8/ref/rrefcasenullif.html
It says that NULLIF is used for conditional expressions, and that it is similar
to CASE, but it doesn't say in plain words how it works. It would be good if it
could mention that NULLIF returns NULL if the two arguments are equal, and that
it returns the first argument if they are not equal.
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