subtarct tow same table from together

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SQL-server-2000

SQL-Server-2005

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hi friends
i have tow same table with tow columns(Code , Cost)
and i wanna subtract this tables

table1 table2
---------------- ----------------
code | cost code | cost
------------- -------------
1 | 100 1 | 50
2 | 200 2 | 100
3 | 300 3 | 200
4 | 400

result = table1 - table2
----------------
code | cost
-------------
1 | 50
2 | 100
3 | 100
4 | 400

please guide me ...

Posted 18-Sep-11 22:09pm

vahid_erad

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Om Prakash Pant · Answer 1 · 2011-09-18T22:19:00

Solution 1

you can use left join for this. example

SQL

select code, a.cost - isnull(b.cost,0) from table1 a 
left join table2 b on a.code = b.code

Posted 18-Sep-11 22:19pm

Om Prakash Pant

Comments

vahid_erad 19-Sep-11 4:24am

How do i for create temp-table ??

vahid_erad 19-Sep-11 4:25am

how do this : isnull(b.cost,0) ?

Om Prakash Pant 19-Sep-11 4:41am

you said you have 2 different tables with same schema and you want to subtract the cost. correct?