RANDOM_STRING returns a string of random characters. The contents of the string are determined by the mode being used. There are 5 modes.
Alphanumericmode (default): all uppercase and lowercase letters in the Latin alphabet and all digits are used (a-z, A-Z and 0-9)
Lettersmode: all uppercase and lowercase letters in the Latin alphabet are used (a-z and A-Z)
Numbersmode: all digits are used (0-9)
Hexmode: all hexadecimal characters are used (0-9 and a-f)
Custommode: a user-provided string is used as the character-set. In addition to letters and digits, this string can include punctuation (
-, etc.), emojis (😊, 👍, 👀, etc.), and characters from non-Latin alphabets (И, 卵, 金, ز, etc.).