You are viewing the documentation of an older version of the TiDB database (TiDB v3.1).
The usage of the functions and operators in TiDB is similar to MySQL. See Functions and Operators in MySQL.
In SQL statements, expressions can be used on the
ORDER BY and
HAVING clauses of the
SELECT statement, the
WHERE clause of
UPDATE statements, and
You can write expressions using literals, column names, NULL, built-in functions, operators and so on. For expressions that TiDB supports pushing down to TiKV, see List of Expressions for Pushdown.