16.20 - Identity Columns and Bulk Inserts - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

Identity column values for rows bulk-inserted into a table defined with a GENERATED ALWAYS identity column are replaced automatically with system-generated numbers. A warning of this replacement is issued only once for all rows inserted using an INSERT ... SELECT statement. Other bulk-inserting utilities such as Teradata Parallel Data Pump and BTEQ imports receive the same warning for each row inserted.

Rows bulk-inserted into tables with either of the following identity column definitions are not guaranteed to be unique unless the appropriate row columns are constrained by a UPI, USI, PRIMARY KEY, or UNIQUE constraint.

  • GENERATED BY DEFAULT
  • GENERATED ALWAYS with CYCLE