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-7024: Alter column not allowed, constraint violation 

Explanation:

The attempt was made to redefine a new value range for a particular column. The SQL statement fails when the table contains rows that do not meet the CONSTRAINT definition.

User Action:

...

       1.      Choose another CONSTRAINT definition or do not change the definition.

       2.      Use a QUERY statement to find out the rows which do not meet the CONSTRAINT definition. You may change or delete them.

 

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