LOWER()

LOWER() is a SQL function in the String Functions category. Converts all characters in a string to lowercase. The syntax is LOWER(string). It accepts string. It returns lowercase string. A typical example: SELECT LOWER('Hello') -- 'hello' A close relative is CONCAT(), which concatenates two or more strings into one string. Returns NULL if any argument is NULL. A close relative is SUBSTRING(), which extracts characters from a string starting at position `start` for `length` characters. A close relative is REPLACE(), which replaces all occurrences of `from_string` with `to_string` in a string. More about this category: String manipulation — CONCAT, SUBSTRING, REPLACE, TRIM, UPPER, LOWER, LENGTH. Related String Functions entries: CONCAT(), SUBSTRING(), REPLACE(), LENGTH(), TRIM(), UPPER(), LPAD() / RPAD(), INSTR(). This page is part of the free SQL Reference documentation covering 762+ statements, functions, and clauses, each with syntax, parameters, return values, and examples for MySQL, PostgreSQL, SQL Server, and SQLite.