Example: Setting an Alternate Constraint Value - Advanced SQL Engine - Teradata Database

You can provide an alternate constraint value in the SQL statement. For example:

MERGE INTO table1 AS tgt USING table2 AS src
   ON (tgt.col1 = src.col1) WHEN MATCHED THEN UPDATE SET Level = 2;

where SET Level = 2 sets the security constraint column “Level” to a value of 2 for all updated rows.

You can alternately specify:

• That a value is taken from another column. For example:

  SET Level = src.column_name ;

• Values for multiple constraint columns. For example:

  SET Level = 2, Class = 4, Job = 7, ... ;