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Query runs too slowly

Posted on 2013-01-17
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Last Modified: 2013-01-21
Here's the query:

SELECT   *
      FROM NC2 a LEFT OUTER JOIN Actions b ON  a.UniqueID = b.DealerID
      WHERE  NOT EXISTS (
                     SELECT c.DealerID
                     FROM    Actions c
                     WHERE  c.DealerID = b.DealerID
                     AND       c.EventID = 1
       )

It works, but it can take over a minute to return records.  The 2 tables only have a few hundred records each.

What I need it to do is the following:

Select every record in NC2 UNLESS the value of UniqueID in NC2 matches up with a field called DealerID in a table called Actions., and then only if they match and the EventID is equal to 1.

Thanks
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Question by:Rush_2112
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Guy Hengel [angelIII / a3] earned 2000 total points
ID: 38788227
you need a index on Actions table, field DealerID
that should help alot.
after that, please show the explain plan of the query
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by:Rush_2112
ID: 38793651
how do i do an explain plan?
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