SQL Server Agent - do not run if there is not data

I have a SQL Server Agent Job that runs and basically all it does is to truncate a table and then load the same table with new data. My issue is that If there in no new data to pull I  do not want to truncate the existing data. So the question is can I or how do I prevent the Truncate table part of the job if there is no data in the source table?
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Ramprakash JeyabalanCommented:
Does your job execute a Stored Procedure? If yes, you can simply use EXISTS() clause to check the data existence in the source table in order to decide whether to truncate the destination table. Include this in your procedure
   TRUNCATE TABLE tblDestination
   INSERT INTO tblDestination SELECT * FROM tblSource

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Russell FoxDatabase DeveloperCommented:
You could try a COUNT on both tables, assuming the row count is the only relevant factor:

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If you need to check for field changes, you might need to track changes: when a row is updated, use a trigger or your update proc to update a DateChanged field, then only replace rows that have changed since the last replacement run. You could also look into creating a HASHBYTES field for each row and look for changed hashes, though I've found that to be too slow on large tables.
SeTechAnalystAuthor Commented:
Would work, but not for all my  circumstances
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Microsoft SQL Server 2008

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