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[Firebird-devel] NULLs in Unique Constraints (was: Null ordering in select expression, my TODO list)
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From: Martijn T. <m.t...@up...> - 2002-09-08 18:32:15
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> 4) I also want to allow unique constraints on nullable fields. SQL92 > allows to have one null value in unique index. This can't be true ... SQL standards don't mention indices :) They do mention CONSTRAINTs ... What does the SQL2000 standard say about unique constraints? Arno? With regards, Martijn Tonies InterBase Workbench - the developer tool for InterBase http://www.upscene.com Upscene Productions http://www.upscene.com "This is an object-oriented system. If we change anything, the users object." |
