homework-jianmu/docs/en/14-reference/03-taos-sql/18-escape.md

title	description	slug
Escape Characters	Detailed rules for using escape characters in TDengine	/tdengine-reference/sql-manual/escape-characters

Escape Character Table

Character Sequence	Represents Character
\'	Single quote '
\"	Double quote "
\n	Newline
\r	Carriage return
\t	Tab
\\	Backslash \
\%	% (rules below)
\_	_ (rules below)

Rules for Using Escape Characters

1. When escape characters are in identifiers (database name, table name, column name, alias)
   1. Regular identifiers: Directly returns an error for invalid identifiers, as identifiers must consist of numbers, letters, and underscores, and cannot start with a number.
   2. Backtick `` identifiers: Remain unchanged, no escaping applied.
2. When escape characters are in data
   1. Encountering the defined escape characters will trigger escaping (see below for % and _); if no matching escape character is found, the escape character \ will be ignored (and \x remains unchanged).
   2. For % and \_, since these characters are wildcards in LIKE, use \\% and \\_ to represent the literal % and \_ in pattern matching with LIKE. If \% or \_ is used outside the context of LIKE pattern matching, they will be interpreted as the strings \% and \_, not as % and \_.