For acquire a subtraction which is faster ?

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For acquire a subtraction which is faster ?
1.Send two queries to SQL database and get two integer data,then : subtraction = (result of query 1 - result of query 2 )
2- Write a subtractions query like :

SQL

select (A)-(B) from Database_name1 inner join Database_name2 on key1=key2 where conditions

Send to Database and get a Direct result

Is there a difference between a simple query and a join query ?
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Additional Info :

SQL Server 2012
Visual Studio 2012 (.Net 4 and higher)
C# environment

Posted 1-Nov-14 21:17pm

Majid Yaghoubi

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OriginalGriff · Answer 1 · 2014-11-01T23:08:00

Single query should be quicker: SQL is pretty efficient and it saves the network communications which are likely to be the bottleneck here.

But instead of asking questions like this, why not try it and see? Use the Stopwatch class and time 10,000 repeats of each operation. the quickest one is the winner...