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34.13. constraint_column_usage

The view constraint_column_usage identifies all columns in the current database that are used by some constraint. Only those columns are shown that are contained in a table owned by a currently enabled role. For a check constraint, this view identifies the columns that are used in the check expression. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint, this view identifies the constrained columns.

Table 34-11. constraint_column_usage Columns

Name Data Type Description
table_catalog sql_identifier Name of the database that contains the table that contains the column that is used by some constraint (always the current database)
table_schema sql_identifier Name of the schema that contains the table that contains the column that is used by some constraint
table_name sql_identifier Name of the table that contains the column that is used by some constraint
column_name sql_identifier Name of the column that is used by some constraint
constraint_catalog sql_identifier Name of the database that contains the constraint (always the current database)
constraint_schema sql_identifier Name of the schema that contains the constraint
constraint_name sql_identifier Name of the constraint