Andy Goth wrote: > The expression "x = NULL" is meaningless since it will always evaluate > to NULL, which CASE interprets as untruth, hence "WHEN NULL THEN" will > never accomplish anything. > [...] > So I'm wondering: can we do better?
The expression "x = x" will fail for NULL, but succeed for everything else. So you can use that to implement a "not-NULL ELSE": CASE x WHEN 1 THEN ... WHEN x THEN 'not NULL' ELSE 'NULL' END > [...] > The next evolution in bloat is to also support AND, OR, NOT, and > parentheses, allowing the LHS operand of any operator in a complex > expression to be omitted So you want to have your beloved COBOL features in SQL? ;-) http://www.3kranger.com/HP3000/mpeix/doc3k/B3150090013.11820/65.htm http://www.csis.ul.ie/cobol/course/Selection.htm Regards, Clemens _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
