Re: SQL99 doc update
От | Thomas Lockhart |
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Тема | Re: SQL99 doc update |
Дата | |
Msg-id | 3D1FD9AB.FD483986@fourpalms.org обсуждение исходный текст |
Ответ на | Re: SQL99 doc update ("Christopher Kings-Lynne" <chriskl@familyhealth.com.au>) |
Ответы |
Re: SQL99 doc update
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Список | pgsql-patches |
> > > This fixes 2 inaccuracies in the recently added SQL99 feature list docs. > > > UNIQUE and DISTINCT predicates are both listed as implemented -- AFAIK, > > > neither is. > > I'm working on adding the IS DISTINCT FROM clause. I haven't looked to > > see about UNIQUE. Remind me to readjust the docs when we get that > > working. > Where are these two new clauses used? I haven't looked yet at UNIQUE. IS DISTINCT FROM takes two row expressions and compares them; if every element compares equal (or if both elements are NULL) then the two expressions are considered to be "not distinct" and FALSE is returned. Otherwise the two expressions are considered to be distinct. - Thoas
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