On Tue, 2006-02-14 at 13:08 -0800, chester c young wrote: <blockquote type="CITE"><pre>
<font color="#000000">> Here is my query SQL:</font>
<font color="#000000">> </font>
<font color="#000000">> SELECT key100 FROM ncccr10</font>
<font color="#000000">> WHERE ncccr10.key100 NOT IN (SELECT key100 FROM ncccr9);</font>
<font color="#000000">> </font>
<font color="#000000">> It is is running after 30 minutes. Here is the query plan:</font>
<font color="#000000">></font>
<font color="#000000">I would try an outer join:</font>
<font color="#000000">select a.key100</font>
<font color="#000000">from ncccr10 a</font>
<font color="#000000">left join ncccr9 b on( key100 )</font>
<font color="#000000">where b.key100 is null;</font>
<font color="#000000">also (hate to be obvious) have you analyzed lately?</font>
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</pre></blockquote> Yes, I did a VACUUM ANALYZE on the entire database before running this query. Also, I get an error
withyour suggestion:<br /><br /> csalgorithm=# SELECT a.key100 FROM ncccr10 a<br /> csalgorithm-# LEFT JOIN ncccr9 b
ON(a.key100)<br/> csalgorithm-# WHERE b.key100 IS Null;<br /> ERROR: argument of JOIN/ON must be type boolean, not
typecharacter<br /><br />