Cause
An attempt was made to drop a column referenced by some constraints.
An attempt was made to drop a column referenced by some constraints.
Drop all constraints referencing the dropped column or specify CASCADE CONSTRAINTS in statement.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/10224925
https://community.oracle.com/message/4284105
https://community.oracle.com/message/9856001
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