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sp_foreignkeys (Transact-SQL)

Returns the foreign keys that reference primary keys on the table in the linked server.

Topic link iconTransact-SQL Syntax Conventions

sp_foreignkeys [ @table_server = ] 'table_server' 
     [ , [ @pktab_name = ] 'pktab_name' ] 
     [ , [ @pktab_schema = ] 'pktab_schema' ] 
     [ , [ @pktab_catalog = ] 'pktab_catalog' ] 
     [ , [ @fktab_name = ] 'fktab_name' ] 
     [ , [ @fktab_schema = ] 'fktab_schema' ] 
     [ , [ @fktab_catalog = ] 'fktab_catalog' ]

[ @table_server = ] 'table_server'

Is the name of the linked server for which to return table information. table_server is sysname, with no default.

[ @pktab_name = ] 'pktab_name'

Is the name of the table with a primary key. pktab_name is sysname, with a default of NULL.

[ @pktab_schema = ] 'pktab_schema'

Is the name of the schema with a primary key. pktab_schemais sysname, with a default of NULL. In SQL Server 2008, this contains the owner name.

[ @pktab_catalog = ] 'pktab_catalog'

Is the name of the catalog with a primary key. pktab_catalogis sysname, with a default of NULL. In SQL Server, this contains the database name.

[ @fktab_name = ] 'fktab_name'

Is the name of the table with a foreign key. fktab_nameis sysname, with a default of NULL.

[ @fktab_schema = ] 'fktab_schema'

Is the name of the schema with a foreign key. fktab_schemais sysname, with a default of NULL.

[ @fktab_catalog = ] 'fktab_catalog'

Is the name of the catalog with a foreign key. fktab_catalogis sysname, with a default of NULL.

Various DBMS products support three-part naming for tables (catalog.schema.table), which is represented in the result set.

Column name

Data type

Description

PKTABLE_CAT

sysname

Catalog for the table in which the primary key resides.

PKTABLE_SCHEM

sysname

Schema for the table in which the primary key resides.

PKTABLE_NAME

sysname

Name of the table (with the primary key). This field always returns a value.

PKCOLUMN_NAME

sysname

Name of the primary key column or columns, for each column of the TABLE_NAME returned. This field always returns a value.

FKTABLE_CAT

sysname

Catalog for the table in which the foreign key resides.

FKTABLE_SCHEM

sysname

Schema for the table in which the foreign key resides.

FKTABLE_NAME

sysname

Name of the table (with a foreign key). This field always returns a value.

FKCOLUMN_NAME

sysname

Name of the foreign key columns, for each column of the TABLE_NAME returned. This field always returns a value.

KEY_SEQ

smallint

Sequence number of the column in a multicolumn primary key. This field always returns a value.

UPDATE_RULE

smallint

Action applied to the foreign key when the SQL operation is an update. SQL Server returns 0, 1, or 2 for these columns:

0=CASCADE changes to foreign key.

1=NO ACTION changes if foreign key is present.

2=SET_NULL; set foreign key to NULL.

DELETE_RULE

smallint

Action applied to the foreign key when the SQL operation is a deletion. SQL Server returns 0, 1, or 2 for these columns:

0=CASCADE changes to foreign key.

1=NO ACTION changes if foreign key is present.

2=SET_NULL; set foreign key to NULL.

FK_NAME

sysname

Foreign key identifier. It is NULL if not applicable to the data source. SQL Server returns the FOREIGN KEY constraint name.

PK_NAME

sysname

Primary key identifier. It is NULL if not applicable to the data source. SQL Server returns the PRIMARY KEY constraint name.

DEFERRABILITY

smallint

Indicates whether constraint checking is deferrable.

In the result set, the FK_NAME and PK_NAME columns always return NULL.

sp_foreignkeys queries the FOREIGN_KEYS rowset of the IDBSchemaRowset interface of the OLE DB provider that corresponds to table_server. The table_name, table_schema, table_catalog, and column parameters are passed to this interface to restrict the rows returned.

Requires SELECT permission on the schema.

The following example returns foreign key information about the Department table in the AdventureWorks database on the linked server, Seattle1.

EXEC sp_foreignkeys @table_server = N'Seattle1', 
   @pktab_name = N'Department', 
   @pktab_catalog = N'AdventureWorks'

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