DRG-12305: column string data type is not supported for index set columns

DRG-12305: column string data type is not supported for
index set columns

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DRG-12305: column string data type is not supported for index set columns..

Answer / guest

Cause: You specified a column in the column list of an index
of an index set which does not have a valid datatype

Action: use only DATE, NUMBER, CHAR, or VARCHAR2 columns in
index column lists

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