Any character can follow ESCAPE except percent (%) and underbar (_). The character _ matches any single character.
Within y, the character % matches any string of zero or more characters except null. Table 6-12 LIKE Conditions Type of Condition For example, if is the escape character, then you can use to search for 6-12 describes the LIKE conditions. You can also search for the escape character itself by repeating it. If the escape character precedes the character % or _ in the pattern, then Oracle interprets this character literally in the pattern rather than as a special pattern-matching character. You can include the actual characters % or _ in the pattern by using the ESCAPE clause, which identifies the escape character. The pattern can contain special pattern-matching characters:Īn underscore (_) in the pattern matches exactly one character (as opposed to one byte in a multibyte character set) in the value.Ī percent sign (%) in the pattern can match zero or more characters (as opposed to bytes in a multibyte character set) in the value. If they differ, then Oracle converts all of them to the datatype of char1. Otherwise, the escape character, if specified, must be a character string of length 1.Īll of the character expressions ( char1, char2, and esc_char) can be of any of the datatypes CHAR, VARCHAR2, NCHAR, or NVARCHAR2. If any of char1, char2, or esc_char is null, then the result is unknown. If esc_char is not specified, then there is no default escape character.
#Mysql like with underscore code#
LIKE4 uses UCS4 code points.ĭescription of the illustration like_condition.gifĬhar1 is a character expression, such as a character column, called the search value.Ĭhar2 is a character expression, usually a literal, called the pattern.Įsc_char is a character expression, usually a literal, called the escape character. LIKE calculates strings using characters as defined by the input character set. Whereas the equality operator (=) exactly matches one character value to another, the LIKE conditions match a portion of one character value to another by searching the first value for the pattern specified by the second. The LIKE conditions specify a test involving pattern matching.
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