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Constraints on user tables

How to get information about constraints posed on user tables? I know we can use user_tables, user_constraints. But I am unable to get the result. Please help in querying metadata about user table level constraints.

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USER_TABLES will show you which tables you have in your schema. USER_CONSTRAINTS will show you all of the constraints on all of the tables in your schema. Constraints typically work on one or more columns. The USER_CONS_COLUMNS will show you the columns of each constraint.

This was first published in December 2006

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