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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: 5.6
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
Sample 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]
PHP script:
example-not-like - php mysql examples | w3resource
List of authors whose names are not started with 'W', along with their country:
AuthorsCountry
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