oracle - special pattern-matching characters

oracle LIKE condition 중 special pattern-matching characters는 아래 두 가지가 있다.

• An underscore (_) in the pattern matches exactly one character (as opposed to one byte in a multibyte character set) in the value.
• A percent sign (%) in the pattern can match zero or more characters (as opposed to bytes in a multibyte character set) in the value. The pattern '%' cannot match a null.