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SAP Sybase SQL Anywhere 16.0 » SQL Anywhere Server - SQL Usage » Data integrity » Entity and referential integrity » Referential integrity checking


Integrity checks on DELETE or UPDATE

Foreign key errors can also arise when performing update or delete operations. For example, suppose you try to remove the R&D department from the Departments table. The DepartmentID field, being the primary key of the Departments table, constitutes the ONE side of a one-to-many relationship (the DepartmentID field of the Employees table is the corresponding foreign key, and forms the MANY side). A record on the ONE side of a relationship may not be deleted until all corresponding records on the MANY side are deleted.

 Referential integrity error on DELETE
 Referential integrity error on UPDATE
 Checking the integrity at commit time
 See also