ESCAPE Feature of LIKE - Analytics Database - Teradata Vantage

SQL Functions, Expressions, and Predicates

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-01-12
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lifecycle
latest
Product Category
Teradata Vantageā„¢

When the defined ESCAPE character is in the pattern string, it must be immediately followed by an underscore, percent sign, or another ESCAPE character.

In a left-to-right scan of the pattern string the following rules apply when ESCAPE is specified:

  • Until an instance of the ESCAPE character occurs, characters in the pattern are interpreted at face value.
  • When an ESCAPE character immediately follows another ESCAPE character, the two character sequence is treated as though it were a single instance of the ESCAPE character, considered as a normal character.
  • When an underscore metacharacter immediately follows an ESCAPE character, the sequence is treated as a single underscore character (not a wildcard character).
  • When a percent metacharacter immediately follows an ESCAPE character, the sequence is treated as a single percent character (not a wildcard character).
  • When an ESCAPE character is not immediately followed by an underscore metacharacter, a percent metacharacter, or another instance of itself, the scan stops and an error is reported.