35.34. referential_constraints

35.34. `referential_constraints`
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## 35.34. `referential_constraints` #

The view `referential_constraints` contains all referential (foreign key) constraints in the current database. Only those constraints are shown for which the current user has write access to the referencing table (by way of being the owner or having some privilege other than `SELECT`).

Table 35.32. referential_constraints Columns

Column Type Description
`constraint_catalog` sql_identifier Name of the database containing the constraint (always the current database)
`constraint_schema` sql_identifier Name of the schema containing the constraint
`constraint_name` sql_identifier Name of the constraint
`unique_constraint_catalog` sql_identifier Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database)
`unique_constraint_schema` sql_identifier Name of the schema that contains the unique or primary key constraint that the foreign key constraint references
`unique_constraint_name` sql_identifier Name of the unique or primary key constraint that the foreign key constraint references
`match_option` character_data Match option of the foreign key constraint: `FULL`, `PARTIAL`, or `NONE`.
`update_rule` character_data Update rule of the foreign key constraint: `CASCADE`, `SET NULL`, `SET DEFAULT`, `RESTRICT`, or `NO ACTION`.
`delete_rule` character_data Delete rule of the foreign key constraint: `CASCADE`, `SET NULL`, `SET DEFAULT`, `RESTRICT`, or `NO ACTION`.

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