17.10 - Identity Columns and Bulk Inserts - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
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