字符串函数
ascii
base64
binary
btrim
char
char_length
character_length
collation_sort_key
concat
conv
concat_ws
contains
endswith
format_string
hex
instr
is_ascii
is_utf8
left
length
lengthb
locate
lower
like
lpad
ltrim
mask
parse_url
position
repeat
replace
reverse
rpad
right
rtrim
space
split
split_part
startswith
str_to_map
substr
substring_index
substring
unbase64
translate
trim
unhex
upper
uuid