17.05 - Example: Upsert on Primary Index - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

This example shows an upsert UPDATE request that does not specify the same primary index value for the UPDATE and INSERT parts of the request.

     UPDATE sales
     SET item_count = item_count + 1
     WHERE (item_nbr = 10
     AND    sale_date = '05/30/2000')
     ELSE INSERT INTO sales (20, '05/30/2000', 1);

The primary index value specified for the UPDATE and the INSERT must be the same. Otherwise, the operation is looking at two different rows: one for UPDATE and the other for the INSERT. This is not the purpose of the upsert form of UPDATE.

Because the specified primary index values of 10 and 20 are not the same, this case returns an error to the user, indicating that the primary index value must be the same for both the UPDATE and the INSERT.