Documentation Home
MySQL 5.6 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 31.1Mb
PDF (A4) - 31.1Mb
PDF (RPM) - 29.3Mb
HTML Download (TGZ) - 7.2Mb
HTML Download (Zip) - 7.2Mb
HTML Download (RPM) - 6.2Mb
Man Pages (TGZ) - 176.3Kb
Man Pages (Zip) - 286.5Kb
Info (Gzip) - 3.0Mb
Info (Zip) - 3.0Mb
Excerpts from this Manual

MySQL 5.6 Reference Manual  /  INFORMATION_SCHEMA Tables  /  The INFORMATION_SCHEMA REFERENTIAL_CONSTRAINTS Table

21.18 The INFORMATION_SCHEMA REFERENTIAL_CONSTRAINTS Table

The REFERENTIAL_CONSTRAINTS table provides information about foreign keys.

The REFERENTIAL_CONSTRAINTS table has these columns:

  • CONSTRAINT_CATALOG

    The name of the catalog to which the constraint belongs. This value is always def.

  • CONSTRAINT_SCHEMA

    The name of the schema (database) to which the constraint belongs.

  • CONSTRAINT_NAME

    The name of the constraint.

  • UNIQUE_CONSTRAINT_CATALOG

    The name of the catalog containing the unique constraint that the constraint references. This value is always def.

  • UNIQUE_CONSTRAINT_SCHEMA

    The name of the schema (database) containing the unique constraint that the constraint references.

  • UNIQUE_CONSTRAINT_NAME

    The name of the unique constraint that the constraint references.

  • MATCH_OPTION

    The value of the constraint MATCH attribute. The only valid value at this time is NONE.

  • UPDATE_RULE

    The value of the constraint ON UPDATE attribute. The possible values are CASCADE, SET NULL, SET DEFAULT, RESTRICT, NO ACTION.

  • DELETE_RULE

    The value of the constraint ON DELETE attribute. The possible values are CASCADE, SET NULL, SET DEFAULT, RESTRICT, NO ACTION.

  • TABLE_NAME

    The name of the table. This value is the same as in the TABLE_CONSTRAINTS table.

  • REFERENCED_TABLE_NAME

    The name of the table referenced by the constraint.


User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
Sign Up Login You must be logged in to post a comment.