I have the following two tables(fields):
synset(synsetid,definition
sense(wordid,synsetid)
both fields are UNIQUE in the synset table, but neither field is UNIQUE in the sense table.
I want to SELECT all definitions whose synsetids are not associated with a specific wordid, like this:
SELECT synset.definition WHERE synset.synsetid = sense.synsetid AND ( sense.wordid != any value that is paired with a sense.synsetid value which is itself paired with wordid=1 in any row)
so for example, if a row (wordid,synsetid): (1,2) exists in the sense table, then the query would select no result from the sense table in which sense.synsetid=2 (regardless of the wordid value).
note that I can't just say "AND wordid != 1" because I also want to exclude rows where wordid != 1, but the synsetid is some value x such that there exists a row (1,x).
How do I turn that into SQL?
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cool.. I made the following change to add the wordid requirement and it works fine (really slow but I think I need to add some indexes)
SELECT wordid, synsetid
FROM sense S
WHERE NOT EXISTS (SELECT synsetid FROM synset P WHERE S.synsetid = P.synsetid AND P.wordid=1)
is it possible to use a similar kind of subquery to solve the problem I am having in the below question?
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by: tigin44Posted on 2008-11-17 at 13:29:01ID: 22979659
this will give you what you want
SELECT wordid, synsetid
FROM sense S
WHERE NOT EXISTS (SELECT synsetid FROM synset P WHERE S.synsetid = P.synsetid)