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Delete from Table A values not found in Table B

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Delete from Table A values not found in Table B MS SQL Development forum discussing administration, MS SQL queries, and other MS SQL-related topics. SQL Server is Microsoft's enterprise database engine.

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  #1  
Old June 7th, 2004, 10:48 AM
robot smiff robot smiff is offline
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Delete from Table A values not found in Table B
I find a number of records with this query:

SELECT *
FROM TableA a
Where Not Exists
(Select * TableB b
Where b.ColumnB1 = a.ColumnA1)

I'd like to delete the records I've found from TableA like this:

Delete FROM TableA a
Where Not Exists
(Select * TableB b
Where b.ColumnB1 = a.ColumnA1)

But alas, the syntax error near "a"

Thanks for any help!
-robot
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  #2  
Old June 7th, 2004, 11:37 AM
swampBoogie swampBoogie is offline
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Code:
Delete FROM TableA
Where Not Exists
(Select * from TableB b
Where b.ColumnB1 = TableA.ColumnA1)
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  #3  
Old June 7th, 2004, 03:24 PM
shammat shammat is offline
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DELETE FROM tableA
WHERE columnA NOT IN (SELECT columnB FROM tableB)

might actually be faster
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  #4  
Old June 8th, 2004, 06:11 AM
swampBoogie swampBoogie is offline
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Since the queries are not equivivalent I don't see the purpose of comparing them performancewise.
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  #5  
Old June 8th, 2004, 07:08 AM
shammat shammat is offline
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Hmm. I would think that they are equivalent. Why do you think the NOT IN does something different then the NOT EXISTS?
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  #6  
Old June 8th, 2004, 10:31 AM
swampBoogie swampBoogie is offline
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The queries will behave differently with regard to nulls.
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