SYSFKEY system view

Each row in the SYSFKEY system view describes a foreign key constraint in the system. The underlying system table for this view is ISYSFKEY.

Column name Column type Description
foreign_table_id UNSIGNED INT The table number of the foreign table.
foreign_index_id UNSIGNED INT The index number for the foreign key.
primary_table_id UNSIGNED INT The table number of the primary table.
primary_index_id UNSIGNED INT The index number of the primary key.
match_type TINYINT The matching type for the constraint. Matching types include:

  • 0 - Use the default matching

  • 1 - SIMPLE

  • 2 - FULL

  • 129 - SIMPLE UNIQUE

  • 130 - FULL UNIQUE

For more information about match types, see the MATCH clause of the CREATE TABLE statement.

check_on_commit CHAR(1) Indicates whether INSERT and UPDATE statements should wait until the COMMIT to check if foreign keys are still valid.
nulls CHAR(1) Indicates whether the columns in the foreign key are allowed to contain the NULL value. Note that this setting is independent of the nulls setting in the columns contained in the foreign key.
Constraints on underlying system table

PRIMARY KEY (foreign_table_id, foreign_index_id)

FOREIGN KEY (foreign_table_id, foreign_index_id) references SYS.ISYSIDX (table_id, index_id)

FOREIGN KEY (primary_table_id, primary_index_id) references SYS.ISYSIDX (table_id, index_id)

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