case not sensitive to null condition ?
v9.0.1 on linux
thedb=# select
''''||bicolumn||'''',
coalesce(permitted_values,'is_null'),
case permitted_values when NULL then 'null' else ''''||permitted_values||'''' end
from bi_constraints limit 2;
?column? | coalesce | case
----------------+---------------+-----------------
'block' | is_null | <--- should be 'null' ??
'design_style' | rls,analog,fc | 'rls,analog,fc'
(2 rows)
Why didn't the case return 'null' in the statement above?
Thanks in Advance !
"Gauthier, Dave" <dave.gauthier@intel.com> writes:
thedb=# select
''''||bicolumn||'''',
coalesce(permitted_values,'is_null'),
case permitted_values when NULL then 'null' else ''''||permitted_values||'''' end
from bi_constraints limit 2;
That's equivalent to "case when permitted_values = NULL then ..." which
doesn't work, because = never succeeds on nulls. You need to write
something like "case when permitted_values IS NULL then ...".
regards, tom lane
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