Paul is right, Drill does not support Except syntax.
In this Jira in comments you can find ways how to rewrite the query to achieve 
the same result: https://issues.apache.org/jira/browse/DRILL-4232 
<https://issues.apache.org/jira/browse/DRILL-4232>

Kind regards,
Arina

> On Jan 16, 2020, at 1:09 AM, Paul Rogers <[email protected]> wrote:
> 
> Hi Itisha,
> 
> Welcome to the Drill user mail list!
> 
> For those readers (like me) who are not familiar with the keyword, EXCEPT 
> works like UNION to join to SELECT statements: SELECT ... EXCEPT SELECT ... 
> See [1]. Seems pretty useful.
> 
> A quick check of our parser source code suggests that Drill does not support 
> the EXCEPT syntax. Drill does not even treat EXCEPT as a keyword.
> 
> Please file a JIRA ticket to request this feature.
> 
> Thanks,
> - Paul
> 
> 
> [1] https://www.tutorialspoint.com/sql/sql-except-clause.htm
> 
> 
> 
>    On Wednesday, January 15, 2020, 12:50:36 AM PST, itisha Gupta 
> <[email protected]> wrote:  
> 
> Hey team,
> 
> I am trying to use EXCEPT operator of Apache drill but it's not working.
> Does Apache drill supports EXCEPT?
> 
> Regards,
> Itisha

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