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09.16.2008 at 10:10AM PDT, ID: 23735873
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9.2

why does this addition to my WHERE clause break my query?

Asked by bitt3n in MySQL Server

I have a functional query that selects data from records in tables synset and sense s1, based on the requirements that (1) selected records in these tables share a synsetid and (2) selected records in s1 contain specific values of wordid, and (3) selected records in s1 have a value for wordid that is not unique to that record (ie, there is at least one other record in s1 that has the same wordid):

SELECT synset.*, s1.* FROM sense s1, synset WHERE s1.synsetid=synset.synsetid AND (s1.wordid=124393 OR s1.wordid=19515 OR s1.wordid=85288) AND EXISTS (SELECT s2.synsetid FROM sense s2 WHERE s1.wordid = s2.wordid AND s1.synsetid <> s2.synsetid)

This query runs OK for synset and sense tables of about 200K records each (0.7 secs).

Another query I have that runs fine removes requirement (3) and adds a requirement (4) that s1.wordid must match the wordid in a third table, word:

SELECT synset.*, s1.*, word.lemma FROM sense s1, synset, word WHERE s1.synsetid=synset.synsetid AND (s1.wordid=124393 OR s1.wordid=19515 OR s1.wordid=85288) AND word.wordid=s1.wordid

However, if I try using both of these requirements (3) and (4):

SELECT synset.*, s1.*, word.lemma FROM sense s1, synset, word WHERE s1.synsetid=synset.synsetid AND (s1.wordid=124393 OR s1.wordid=19515 OR s1.wordid=85288) AND word.wordid=s1.wordid AND EXISTS (SELECT s2.synsetid FROM sense s2 WHERE s1.wordid = s2.wordid AND s1.synsetid <> s2.synsetid)

My query fails to complete (just runs on forever).

What am I doing wrong in the last query?Start Free Trial
[+][-]09.16.2008 at 10:13AM PDT, ID: 22490742

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[+][-]09.16.2008 at 10:44AM PDT, ID: 22491080

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