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Column failed to delete

Posted on 2007-04-11
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Last Modified: 2013-12-18
I got htis error message when I tried to delete this column but unsure how to narrow effect the deletion of this column successfully. Below is the error message I got:

SQL> --Removing VDS_KEY from Table VA_VULNERABILITIES table  

ALTER TABLE VA_VULNERABILITIES DROP (VDS_KEY)
;SQL> SQL>   2  
ALTER TABLE VA_VULNERABILITIES DROP (VDS_KEY)
                                     *
ERROR at line 1:
ORA-12991: column is referenced in a multi-column constraint

Please advice.
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Question by:jbfannie
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4 Comments
 
LVL 42

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by:dqmq
dqmq earned 250 total points
ID: 18892383
Look at your foreign key constraints for VA_VULNERABILITIES.  Odds are, one of them includes VDS_KEY.  Drop that constraint first, then you can drop the column.
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LVL 42

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by:dqmq
dqmq earned 250 total points
ID: 18892415
If not a foreign key, the VDS_KEY could be part of the primary key or a unique constraint. However, dropping either of those has far more serious implications.
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LVL 32

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by:awking00
awking00 earned 100 total points
ID: 18892448
To find the constraint -
select constraint_name from user_cons_columns
where table_name = 'VA_VULNERABILITIES'
and column_name = 'VDS_KEY';
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Accepted Solution

by:
imaredia earned 150 total points
ID: 18903721
You are attempting to drop this column which is referenced by some other constraints, so to drop this column you can use either of the two ways below:
   1. Drop all the constraints referencing this column and then try to drop this column.  OR
   2. Use CASCADE CONSTRAINTS in your statement.

To find out which constraints are being referenced to this column use the query given by awking00.
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