Hmm… I have been using SQL for quite some time. But I do not know how to compare 2 tables to find out the different records. For example, I have 2 tables which are table A and table B. Both of them have some similar records. But I want to filter out the different data only. How can I do so? I searched online and discovered the method to do so. It is located in Microsoft SQL Server 2005 Books Online. All we need to do is use EXCEPT function in SQL.
Query to compare 2 tables to find the different
SELECT * FROM TableA EXCEPT SELECT * FROM TableB;
Query to compare 2 tables to find the matches
SELECT * FROM TableA INTERSECT SELECT * FROM TableB;
Hope this will help you too. 
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but this seems not workable in Microsoft Access ?!
Yeah .It is great.Thank for a lot
okay but if we have a column that concatenates 3 colums and becomes a unique identifier ; how would you filter out the difference of data from table 1 and table 2 please
select * from (select concat(a,b,c) as abc , d,e from t1 except select abc,d,e from t2) should work…