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Compare two columns in different tables and extract difference between them

Posted on 2004-08-24
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Last Modified: 2012-06-21
I am using MS-SQL Query Analyser.

I have two tables ("A" & "B") that both have a column named "X".  Both columns contain the same type of information.  There are some differences betwen the contents of the 2 columns.

In particular, Table A col X contains a list of approx 100000 distinct numbers.  Table B col X contains approx 1 million numbers (not distinct).

I need to find out which numbers in table B col X do not exist in table A col X.  Help please!!!!!!  Thank you!
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Question by:thedaveg155
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Expert Comment

by:Helena Marková
ID: 11880496
This works in Oracle, I think you can change it if neccessary to  MS-SQL:

Select X from B
MINUS
Select X from A;
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Accepted Solution

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thedaveg155 earned 0 total points
ID: 11881096
Just figured it myself.  Thanks for the comment but it didn't work for me.

Either:
SELECT DISTINCT * FROM A
WHERE X Not In (SELECT DISTINCT X FROM B)
Or:
SELECT A.* FROM A
LEFT JOIN B on A.X = B.X
WHERE B.X Is Null
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LVL 22

Expert Comment

by:Helena Marková
ID: 11890224
You can ask 0-point question in a Community Support for refunding points :)
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Expert Comment

by:mlmcc
ID: 12032443
This question has been answered by the asker.

mlmcc
DB Reporting Tools PE
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