Apa fungsi perintah like test pada mysql

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:

List of authors whose names are not started with 'W', along with their country:

query('SELECT aut_name, country
FROM author
WHERE aut_name NOT LIKE "W%"') as $row) {
echo "";
echo "";
echo "";
echo "";
}
?>


Authors
Country
" . $row['aut_name'] . "
" . $row['country'] . "

View the example in browser

JSP script:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>







<%
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
String Host = "jdbc:mysql://localhost:3306/w3resour_bookinfo";
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
connection = DriverManager.getConnection(Host, "root", "datasoft123");
statement = connection.createStatement();
String Data = "SELECT aut_name,country FROM author WHERE aut_name NOT LIKE'W%'";
rs = statement.executeQuery(Data);
%>

<%
while (rs.next()) {
%>

<%   }    %>


Authors
Country

<%=rs.getString("aut_name")%>
<%=rs.getString("country")%>

<%
rs.close();
statement.close();
connection.close();
} catch (Exception ex) {
out.println("Can’t connect to database.");
}
%>

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

Sample 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)

PHP script:

List of authors whose countries don't contain 'U_A' or 'C__a_a', along with their country and home city:

query('SELECT aut_name, country,home_city
FROM author
WHERE country NOT LIKE "U_A" and country NOT LIKE  "C__a_a"') as $row) {
echo "";
echo "";
echo "";
echo "";
echo ""; 
}
?>


Authors
Country
Home city
" . $row['aut_name'] . "
" . $row['country'] . "
" . $row['home_city'] . "

View the example in browser

Online Practice Editor:

Slideshow of MySQL Comparison Function and Operators

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