PostgreSQL 7.4 Documentation
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# 32.10. 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 the current user. 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 32-8. 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

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