The EXCEPT operator returns all of the distinct rows from the query to the left of the EXCEPT operator when there are no matching rows in the right query. The EXCEPT operator is equivalent of the Left Anti Semi Join. EXCEPT operator works the same way NOT IN. EXCEPTS returns any distinct values from the query to the left of the EXCEPT operand that do not also return from the right query.
Example of EXCEPT operator is displayed along Example of NOT IN. If you run both of the Query and compare the Execution plan it is exactly the same. EXCEPT and NOT IN does same functions and have the same execution plan, but EXCEPT has much simpler syntax. The row-by-row comparison provided by EXCEPT, combined with the number of rows being returned remaining consistent, provides compelling evidence that re-factored query is correct. EXCEPT works with * as well as aliases.
Example: (Both of the scripts returns the same number of rows)
----SQL SERVER 2005 Method USE AdventureWorks; GO SELECT ProductID FROM Production.Product EXCEPT SELECT ProductID FROM Production.WorkOrder; GO ----SQL SERVER 2000 Method, which works&nbspIN SQL SERVER 2005 USE AdventureWorks; GO SELECT ProductID FROM Production.Product WHERE ProductID NOT IN ( SELECT ProductID FROM Production.WorkOrder); GO
Following the execution plan which indicates EXCEPT and NOT IN uses same execution plan.
Reference : Pinal Dave (https://blog.sqlauthority.com)
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Hello Sir,
ALTER PROCEDURE [dbo].[Select_Data_zonetext]
@ZoneCode varchar(200),
@id bigint
AS
BEGIN
SET NOCOUNT ON;
select * from tb_xxx where ZoneCode IN(@ZoneCode) and id=@id
END
the above sample stored procedure not shows any error but not retrieve required information.. please help me about this . thanks in advance
The select statement should be
select * from tb_xxx where ‘,’+@ZoneCode+’,’ like ‘%,’+cast(ZoneCode as varchar(10))+’,%’ and id=@id
Thanks for this – I’ve spent ages working out why my NOT IN returns inconsistent results – there were NULLs in my list!
Nice share
I have a problem , i need to put multiple conditions added with OR operator inside a conditional statement like we do in the common programming language like
if( a==”2″ || b==”3″)
{
}
else
{
}
i want the same in T-SQL , can you help me !!
You can use IF-ELSE statement in T-sql too. Refer this post
Also post some sample data with eected result
hello all,
the NOT IN is not working for me in the below script, but does work when i use EXCEPT. can you tell me why is this happening?
below are my script:
— this one returns an empty dataset
SELECT DISTINCT dbo.tblGrant.GrantID FROM dbo.tblGrant WHERE dbo.tblGrant.GrantID NOT IN
(SELECT distinct dbo.tblBeneficiaryServices.GrantID FROM dbo.tblBeneficiaryServices ) AND dbo.tblGrant.GrantID NOT IN
(SELECT DISTINCT dbo.tblBeneficiaryServiceLog.GrantID FROM dbo.tblBeneficiaryServiceLog )
— this one returns over 900 records
SELECT DISTINCT dbo.tblGrant.GrantID FROM dbo.tblGrant EXCEPT
(SELECT distinct dbo.tblBeneficiaryServices.GrantID FROM dbo.tblBeneficiaryServices union
SELECT DISTINCT dbo.tblBeneficiaryServiceLog.GrantID FROM dbo.tblBeneficiaryServiceLog )
I find in some cases a comparative join offers more flexibility and may perform better as well. A trivial example would read something like
select col1, col2, col3
from table1 t1
left outer join table2 t2 on t2.col1 = t1.col1
where t2.col1 is null
This assumes a grain match between the two related columns. To acount for grain mismatch where multiple rows exist in t2 for each row in t1 this can be tuned as
select col1, col2, col3
from table1 t1
left outer join (select distinct col1 from table2) t2 on t2.col1 = t1.col1
where t2.col1 is null
What I like about this approach is that the object we check against can include any number of checks and conditions within the inline view and the comparison list is whatever you want ti to be.
thank you sir
Hi , i am having one table in which i am having unique audit history id . i want to compare both the rows and get only those columns whose values are different and leave the remaining columns. is it possible?????
i want to know how the except operator perform in sql….. plz clear my confusion bcoz i already read about this by book or in net but my cinfusion is still same….
select * from table1
except
select * from table2
The result is all the rows from table1 which are not available in table2
Like the same can we have other operator for IN, which both behave the same functionality
in case of EXCEPT both the table should have equal no of record , if not You can use NOT IN
if both table have same no of record in that case you can use EXCEPT other wise use NOT IN
Hi Guys,
What’s the cost to use EXCEPT statement in queries that return above of 1,000,000 of rows?
Grettings
-Luis
We can not generalize and say Except is same as NOT IN. Number of data points your are joining/comparing matters.