mysql functions actions purpose is return the function definition. you try below mention these functions:
ASCII,
CHARLENGTH,
CHARACTERLENGTH,
CONCAT,
CONCATWS,
FIELD,
FINDINSET,
FORMAT,
INSERT,
INSTR,
LCASE,
LEFT,
LENGTH,
LOCATE,
LOWER,
LPAD,
LTRIM,
MID,
POSITION,
REPEAT,
REPLACE,
REVERSE,
RIGHT,
RPAD,
RTRIM,
SPACE,
STRCMP,
SUBSTR,
SUBSTRING,
SUBSTRINGINDEX,
TRIM,
UCASE,
UPPER,
ABS,
ACOS,
ASIN,
ATAN,
ATAN2,
AVG,
CEIL,
CEILING,
COS,
COT,
COUNT,
DEGREES,
DIV,
EXP,
FLOOR,
GREATEST,
LEAST,
LN,
LOG,
LOG10,
LOG2,
MAX,
MIN,
MOD,
PI,
POW,
POWER,
RADIANS,
RAND,
ROUND,
SIGN,
SIN,
SQRT,
SUM,
TAN,
TRUNCATE,
ADDDATE,
ADDTIME,
CURDATE,
CURRENTDATE,
CURRENTTIME,
CURRENTTIMESTAMP,
CURTIME,
DATE,
DATEDIFF,
DATEADD,
DATEFORMAT,
DATESUB,
DAY,
DAYNAME,
DAYOFMONTH,
DAYOFWEEK,
DAYOFYEAR,
EXTRACT,
FROMDAYS,
HOUR,
LASTDAY,
LOCALTIME,
LOCALTIMESTAMP,
MAKEDATE,
MAKETIME,
MICROSECOND,
MINUTE,
MONTH,
MONTHNAME,
NOW,
PERIODADD,
PERIODDIFF,
QUARTER,
SECOND,
SECTOTIME,
STRTODATE,
SUBDATE,
SUBTIME,
SYSDATE,
TIME,
TIMEFORMAT,
TIMETOSEC,
TIMEDIFF,
TIMESTAMP,
TODAYS,
WEEK,
WEEKDAY,
WEEKOFYEAR,
YEAR,
YEARWEEK,
BIN,
BINARY,
CASE,
CAST,
COALESCE,
CONNECTIONID,
CONV,
CONVERT,
CURRENTUSER,
DATABASE,
IF,
IFNULL,
ISNULL,
LASTINSERTID,
NULLIF,
SESSION USER,
SYSTEM USER,
USER,
VERSION,