Usage Notes

Teradata Vantage™ Data Types and Literals

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1143-162K

CHECK constraints are applied to rows generated as candidates for INSERT and UPDATE operations.

You cannot specify CHECK constraints for Identity columns.

If the condition is met or the proposed INSERT or UPDATE contains NULLs, the operation is permitted.

If the condition is not met, an error is reported as a constraint violation. For details on the syntax, see “CREATE TABLE” in Teradata Vantage™ SQL Data Definition Language Syntax and Examples, B035-1144.

For character data, constraints are checked using the current session collation. Therefore, it is possible for a value to meet the constraint for one collation and violate the constraint for another collation.

Also see “Constraint Specifications” in Teradata Vantage™ - Database Design, B035-1094.