MySQL NOT LIKE operator
NOT LIKE operator
MySQL NOT LIKE is used to exclude those rows which are matching the criterion followed by LIKE operator.
Syntax:
expr NOT LIKE pat [ESCAPE 'escape_char']
- Pattern matching using SQL simple regular expression comparison. Returns 1 (TRUE) or 0 (FALSE). If either expr or pat is NULL, the result is NULL.
- The pattern need not be a literal string. For example, it can be specified as a string expression or table column.
- Per the SQL standard, LIKE performs matching on a per-character basis, thus it can produce results different from the = comparison operator.
- LIKE operator uses WILDCARDS (i.e. %, _) to match the pattern. This is very useful to check whether a particular character or string is present in the records.
% is used to match any number of characters, even zero characters.
_ is used to match exactly one character.
To test for literal instances of a wildcard character, precede it by the escape character. If you do not specify the ESCAPE character, “\” is assumed.
\% is used to match one "%" character.
\_ Matches one "_" character
MySQL Version: 8.0
Example: MySQL NOT LIKE operator with (%) percent
The following MySQL statement excludes those rows from the table author, having the 1st character of aut_name ‘W’.
Code:
SELECT aut_name, country
FROM author
WHERE aut_name NOT LIKE 'W%';
Relational Algebra Expression:
Relational Algebra Tree:
Sample table: author
Output:
mysql> SELECT aut_name, country -> FROM author -> WHERE aut_name NOT LIKE 'W%'; +----------------------+-----------+ | aut_name | country | +----------------------+-----------+ | S.B.Swaminathan | India | | Thomas Morgan | Germany | | Thomas Merton | USA | | Piers Gibson | UK | | Nikolai Dewey | USA | | Marquis de Ellis | Brazil | | Joseph Milton | USA | | John Betjeman Hunter | Australia | | Evan Hayek | Canada | | E. Howard | Australia | | C. J. Wilde | UK | | Butler Andre | USA | +----------------------+-----------+ 12 rows in set (0.00 sec)
Example : MySQL NOT LIKE operator with ( _ ) underscore
The following MySQL statement excludes those rows from the table author having the country name like the above pattern as specified with LIKE operator.
Code:
SELECT aut_name, country,home_city
FROM author
WHERE country NOT LIKE 'U_A' and country NOT LIKE 'C__a_a';
Relational Algebra Expression:
Relational Algebra Tree:
Sample table: author
Output:
mysql> SELECT aut_name, country,home_city -> FROM author -> WHERE country NOT LIKE 'U_A' and country NOT LIKE 'C__a_a'; +----------------------+-----------+----------------+ | aut_name | country | home_city | +----------------------+-----------+----------------+ | William Norton | UK | Cambridge | | William Anthony | UK | Leeds | | S.B.Swaminathan | India | Bangalore | | Thomas Morgan | Germany | Arnsberg | | Piers Gibson | UK | London | | Marquis de Ellis | Brazil | Rio De Janerio | | John Betjeman Hunter | Australia | Sydney | | E. Howard | Australia | Adelaide | | C. J. Wilde | UK | London | +----------------------+-----------+----------------+ 9 rows in set (0.00 sec)
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