Function to convert bytes to KB/MB/TB etc in SQL

format_bytes.sql

CREATE FUNCTION `format_bytes` (val float)
RETURNS varchar(20)
DETERMINISTIC
CONTAINS SQL
BEGIN
    DECLARE pw smallint;
    IF val < 1024 THEN
        return CONCAT(val, ' B');
    END IF;
    SET pw = LEAST(7, FLOOR(LOG(val) / LOG(1024)));
    RETURN CONCAT(ROUND(val / POW(1024, pw), 2), ' ', SUBSTR('KMGTPEZY', pw, 1), 'B');
END