Common functions of MySQL (String functions)

ASCII (char) returns the ASCII code value of a character
Bit_length (str) returns the bit length of a string
CONCAT (S1,S2...,SN) to concatenate s1,s2...,sn into a string
Concat_ws (SEP,S1,S2...,SN) joins the S1,S2...,SN into a string and uses the Sep character interval
Insert (STR,X,Y,INSTR) starts the string str from the x position, and the Y-character substring is replaced with a string instr, returning the result
Find_in_set (str,list) parses a comma-delimited list of lists, and if STR is found, returns the position of STR in the list
LCASE (str) or lower (str) Returns the result of changing all characters in the string str to lowercase
Left (str,x) returns the leftmost X character in a string str
LENGTH (s) returns the number of characters in the string str
LTRIM (str) cuts the opening space from the string str
POSITION (SUBSTR,STR) returns the position of the substring substr the first occurrence in the string str
QUOTE (str) escapes single quotation marks in Str with a backslash
REPEAT (STR,SRCHSTR,RPLCSTR) Returns the result of a string str repeating x times
REVERSE (str) Returns the result of reversing the string str
Right (STR,X) returns the rightmost X character in a string str
RTRIM (str) returns a space at the trailing end of a string str
STRCMP (S1,S2) comparing strings S1 and S2
TRIM (str) removes all whitespace from string header and trailing
UCASE (str) or upper (str) returns the result of converting all characters in the string str to uppercase

Common functions of MySQL (String functions)