xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity
homework-jianmu/docs/en/12-taos-sql/18-escape.md

1.4 KiB
Raw Blame History

title description
Escape Characters This document describes the usage of escape characters in TDengine.

Escape Characters

Escape Character Actual Meaning
\' Single quote '
\" Double quote "
\n Line Break
\r Carriage Return
\t tab
\\ Back Slash \
\% % see below for details
\_ _ see below for details

Restrictions

  1. If there are escape characters in identifiers (database name, table name, column name)
    • Identifier without ``: Error will be returned because identifier must be constituted of digits, ASCII characters or underscore and can't be started with digits
    • Identifier quoted with ``: Original content is kept, no escaping
  2. If there are escape characters in values
    • The escape characters will be escaped as the above table. If the escape character doesn't match any supported one, the escape character "" will be ignored.
    • "%" and "_" are used as wildcards in like. \% and \_ should be used to represent literal "%" and "_" in like,. If \% and \_ are used out of like context, the evaluation result is "\%"and "\_", instead of "%" and "_".