BIN()BIT_LENGTH()CHAR_LENGTH()CONCAT()CONCAT_WS()EMPTY()ENDSWITH()FIELD()FIND_IN_SET()FORMAT()HEX()INSTR()LCASE()LEFT()LENGTH()LOCATE()LOWER()LPAD()LTRIM()OCT()REPEAT()REVERSE()RPAD()RTRIM()SHA2()SPACE()SPLIT_PART()STARTSWITH()SUBSTRING()SUBSTRING_INDEX()TRIM()UCASE()UPPER()正则表达式