外申请和左加入

Question

I am using outer apply in sql server. can someone please explain if there is any performance difference between Outer Apply and Left Join ?

Answer 1

Your question is not really correct.

APPLY uses to join table with table-valued functions

JOIN we use to join two tables.

You may find more information in MSDN articles:

APPLY http://technet.microsoft.com/en-us/library/ms175156(v=sql.105).aspx .

JOIN http://technet.microsoft.com/en-us/library/ms191517(v=sql.105).aspx