15.00 - Adding or Dropping Referential Constraints - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

Teradata Database
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Programming Reference
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English (United States)

Adding or Dropping Referential Constraints

Referential Constraints provide the Optimizer with an efficient method for producing better query plans that take advantage of defined, but unenforced, referential relationships.

Other than not enforcing referential integrity and not requiring the candidate key for the referenced table in the constraint to be explicitly declared to be unique, the rules for Referential Constraints (Referential Constraints are sometimes called soft referential integrity constraints.) are identical to those documented by “Adding or Dropping Standard Referential Integrity Constraints” on page 72. See “Referential Constraints” on page 563 for additional information.