Difference between join and subquires

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1).Difference between join and subquries in sq server?
2).join and subquires will give same reslut set?
if possible tell me how?

Posted 31-Dec-13 20:23pm

kalisiddayya

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Peter Leow · Accepted Answer · 2013-12-31T20:43:00

Solution 1

You can find plenty of discussions on the web. Check out these two:
1. join-and-sub-query[^]
2. SQL Joins and Subqueries[^]

Posted 31-Dec-13 20:43pm

Peter Leow

Christian Graus · Accepted Answer · 2013-12-31T20:44:00

You should consider buying a book on SQL, or using Google. Your question is basic, top level, and very difficult to answer fully in a forum reply.

In short, a sub query means the same query has to run for every row in the main query. A join runs once and then joins. It's faster, and more efficient. There's always a lot of ways to get the same result in SQL, what you're talking about is a question of better processes, not different results.