where 子句的执行顺序

set statistics io on
set statistics time on
go
set statistics profile on
go

use pubs
select * from authors
where (au_fname like 'S%' or au_fname like 'a%')
and (state like 'CA' or state like 'UT')
and (cast(zip as int) > 90000)

select * from authors
where (au_fname like 'S%' or au_fname like 'a%')
and (cast(zip as int) > 90000)
and (state like 'CA' or state like 'UT')

select * from authors
where (cast(zip as int) > 90000)
and (au_fname like 'S%' or au_fname like 'a%')
and (state like 'CA' or state like 'UT')

|--Clustered Index Scan(OBJECT:([pubs].[dbo].[authors].[UPKCL_auidind]), WHERE:(CONVERT(int,[pubs].[dbo].[authors].[zip],0)>(90000) AND ([pubs].[dbo].[authors].[au_fname] like 'S%' OR [pubs].[dbo].[authors].[au_fname] like 'a%') AND ([pubs].[dbo].[authors].[state] like 'CA' OR [pubs].[dbo].[authors].[state] like 'UT')))