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Update column based on constraints

Update column based on constraints

Update column based on constraints

Hi All,

Want to update a column based on 2 columns at Table level and would like some help.


Current Table structure: tblCheckId
    RightId text(25), WrongId text(25), RightId_chk text(1)

Indexes in TblCheckId:
Indx1  is RightId+RightId_Chk  in this combination Unique as Yes
Indx2  is WrongId              Unique as Yes

Value in table: tblCheckId 
    RightId	  WrongId       RightId_Chk
    Material1		        Y
    Material1     mtrl1
    Material1     Mtrial1

Gives error in below sql:
ALTER table tblCheckId
ADD constraint (RightId is not null AND 
                WrongId is null references tblcheckid 
                on UPDATE SET RightId_chk ="Y") 

Error: constraint clause

How to UPDATE columnn RightId_Chk to value 'Y' only when
RightId is Not Null and WrongId is null

or is there another way to achieve this condition.



RE: Update column based on constraints

UPDATE tblCheckId
SET RightId_Chk = 'Y'

Have fun.

---- Andy

RE: Update column based on constraints

Hi All,

Can we store UPDATE command with the table itself ?
That is when a user enters material in column RightId and WrongId is left blank, RightId_Chk is updated to Y.

The UPDATE command should run by itself like a trigger in access 2010.


RE: Update column based on constraints

Hi All,

Thanks, it is working.

In Access 2010 you go to design mode, In design mode select the field getting updated e.g. rightid, than click icon Create Data Macro, select Before change and use the condition.

Thanks for all you help.


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