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Create NULL value within CAST(CASE)

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Last Modified: 2012-06-27
I am importing data from multiple old tables into a new table and I have a field that is INT but if there are no values, I need it to be NULL.  How can I specify a NULL value in the following:

intAID =
     CAST(CASE strAInfo
                   WHEN 'blah blah blah' THEN '1'
                   WHEN 'hee hee hee' THEN '2'
                   WHEN 'nada nada nada' THEN '3'
                   ELSE 'NULL'
      END as int),
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