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Check for Existing Data in a table (SQL 2008)

Posted on 2014-03-04
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Last Modified: 2014-03-04
I first want to check if data exists in a table A, then if yes I want to truncate data in table B and replace with the data in table A. If No I do not want to do anything.
I believe there is some sort of row function or exist statement that is needed, however my attempts are causing errors. Please advise. Thanks
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Question by:SeTech
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5 Comments
 
LVL 25

Expert Comment

by:Lee Savidge
ID: 39902960
if exists (select top 1 * from tableA)
begin
  truncate table tableA
  insert into tableB
  select * from tableA -- this assumes your table structures are the same. If not, select only the columns you want
end

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Author Comment

by:SeTech
ID: 39902986
Thanks and one additional quesiton on your post. Should the truncate table tableA really be truncate table tableB as that is the table I want to update. So most likley that was just a typo?
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LVL 25

Accepted Solution

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Lee Savidge earned 500 total points
ID: 39903023
A typo. Truncate tableB.

Obviously you will want to test this first.
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Author Closing Comment

by:SeTech
ID: 39903089
Thanks worked PERFECTLY
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LVL 25

Expert Comment

by:Lee Savidge
ID: 39903245
Splendid!

Glad to be of help :)
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