17.05 - Example: Upsert Without Specifying Primary Index - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Language
English (United States)
Last Update
2021-01-22
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This example shows an upsert UPDATE request that does not specify the primary index in its WHERE clause.

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

When the primary index is not specified in the UPDATE portion of an upsert request, the operation could have to perform an all-row scan to find rows to update. This is not the purpose of upsert form of UPDATE. This case returns an error.