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How to reference the primary table in a nested select in an Update statement

Posted on 2008-10-24
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Last Modified: 2013-12-07
I'm getting the following error when trying to run the attached Update statement.   It occurs on the line in the nested selects that reference the DT.taskorder field.  

Can anyone help?

PL/SQL:  ORA-00904: "DT"."TaskOrder": invalid identifier.

UPDATE go.Tasks DT

SET	StartDate = 

	(Select startdate from 

		(select startdate 

		from go.Tasks X 

		where X.ePHPID 	= p_ePHPID 

		and X.Method 	= p_Method 

		and X.TaskOrder	= DT.taskorder 

		and X.Subtask 	= 'N' 

		order by X.taskorder)

	Where RowNum = 1),

	EndDate =

	(Select endDate from 

	         (Select endDate 

                                  from go.Tasks W

		where W.ePHPID 	= p_ePHPID 

		and W.method 	= p_Method 

		and W.TaskOrder	= DT.taskorder 

		and W.Subtask	= 'N'  

		order by W.taskorder),

	Where rowNum = 1)

where ePHPID = p_ePHPID 

and Method = p_Method 

and Subtask = 'Y';

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Question by:sgrzesik
3 Comments
 
LVL 5

Expert Comment

by:jfmador
ID: 22798449
Hello sorry I don't know much oracle but I you are defining twice your query, Under SQL Server i would give a try to something like this


update Tasks

SET Tasks.StartDate = t.StartDate, Tasks.EndDate = t.EndDate

from Tasks inner join

(

	Select TasksOrder, min(startdate) as startdate, min(endDate) as enddate  

	FROM go.Tasks x

	inner join go.Tasks dt on x.TaskOrder = dt.TaskOrder and x.EPHPID = dt.EPHPID AND x.Method = dt.Method

	where X.ePHPID 	= p_ePHPID 

	and X.Method 	= p_Method 

	and X.Subtask 	= 'N' 

	AND dt.subtask  = 'Y'

	GROUP BY TasksOrder

) t on Tasks.TasksOrder = t.TasksOrder

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LVL 9

Accepted Solution

by:
MarkusId earned 500 total points
ID: 22798604
Hi!

As far as I know it was not possible (at least until version 9) to reference an external column in a nested select. So you might this give a try:
UPDATE go.Tasks DT

SET     StartDate = 

        (Select startdate from 

                (select startdate, X.TaskOrder

                from go.Tasks X 

                where X.ePHPID  = p_ePHPID 

                and X.Method    = p_Method 

                and X.Subtask   = 'N' 

                order by X.taskorder) x

        Where x.taskOrder = dt.taskorder

        and   RowNum = 1),

        EndDate =

        (Select endDate from 

                 (Select endDate, x.TaskOrder

                                  from go.Tasks W

                where W.ePHPID  = p_ePHPID 

                and W.method    = p_Method 

                and W.Subtask   = 'N'  

                order by W.taskorder) w

        Where w.taskorder = dt.taskorder

          and rowNum = 1)

where ePHPID = p_ePHPID 

and Method = p_Method 

and Subtask = 'Y';

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0
 

Author Comment

by:sgrzesik
ID: 22799145
That works, thanks!
0

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