Question

What is more efficiency: to do update with join or to do update with where.

Here is my code:

Join:

CREATE procedure [dbo].[MyProc]
@tvp myType readonly
as
 update tb
 set pp_update=CONVERT(date,GETDATE(),101)
 from myTable tb
 join @tvp t on t.crc32 = tb.pp_crc32

Where:

CREATE procedure [dbo].[MyProc]
@tvp myType readonly
as
 update tb
 set pp_update=CONVERT(date,GETDATE(),101)
 from myTable tb
 where t.crc32 = tb.pp_crc32

What is prefer? and if I have 2 terms can I use join??

Answer 1

I think you have a typo error at the second query. Maybe you mean

CREATE procedure [dbo].[MyProc]
@tvp myType readonly
as
 update tb
 set pp_update=CONVERT(date,GETDATE(),101)
 from myTable tb, @tvp t
 where t.crc32 = tb.pp_crc32

The two queries are the same. The only thing is that the first query is in ANSI SQL-92 syntax while the other one is the SQL-89 (old one) syntax.