16.20 - LEFT - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates
Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Published
March 2019
Language
English (United States)
Last Update
2020-03-25
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Purpose

Truncates in input string to a specified number of characters.

The LEFT function can be called with the 'LEFT' or 'TD_LEFT' alias names.

The arguments include two parameters:
  • First Parameter

    The input string that the substring is created from. CHAR, VARCHAR, and CLOB are supported, but other types must be explicitly cast. The input can be null or an empty string.

  • Second Parameter

    A positive integer specifying the number of characters desired from the left side of the string. If the number of character exceeds the number of characters in the original string, the original string is returned.

Syntax



TD_SYSFNLIB.
Name of the database where the function is located.
source_string
A character string or string expression.
If source_string is NULL, NULL is returned.
length
An integer specifying the length of the returned string.