PostgreSQL 7.4 Documentation
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# 32.18. key_column_usage

The view key_column_usage identifies all columns in the current database that are restricted by some unique, primary key, or foreign key constraint. Check constraints are not included in this view. Only those columns are shown that are contained in a table owned the current user.

Table 32-16. key_column_usage Columns

Name | Data Type | Description
--- | --- | ---
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
table_catalog | `sql_identifier` | Name of the database that contains the table that contains the column that is restricted 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 restricted by some constraint
table_name | `sql_identifier` | Name of the table that contains the column that is restricted by some constraint
column_name | `sql_identifier` | Name of the column that is restricted by some constraint
ordinal_position | `cardinal_number` | Ordinal position of the column within the constraint key (count starts at 1)

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