36.18. 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 36.16. 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