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Escape Characters

Below table is the list of escape characters used in TDengine.

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

:::note Escape characters are available from version 2.4.0.4 .

:::

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 "_".