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Where by one column

Author

Topic

yoyosh
Starting Member

27 Posts

Posted - 2013-01-30 : 04:19:48

Why the following query is incorrect?

select (select top 1 date from pass_in_trip p where p.trip_no = t.trip_no) as date
from trip t
where date is not null

It says: Invalid column name 'date'.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-01-30 : 04:25:16

date is an alias created in same level so cant be used in where like that. so you need to tweak it like this


select *
from
(
select (select top 1 date from pass_in_trip p where p.trip_no = t.trip_no) as [date]
from trip t
)p
where [date] is not null

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

yoyosh
Starting Member

27 Posts

Posted - 2013-01-30 : 06:29:34

Thank you

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-01-30 : 06:48:28

welcome

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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