What does % mean in mysql

The percent sign % in MySQL is a wildcard character that can match any sequence of characters. It can be used for: 1. String matching (such as: LIKE '%string%'); 2. Range query (such as: BETWEEN '%start%' AND '%end%'); 3. Regular expression matching (such as: REGEXP '%.*%'); Note: % matches any character sequence, but cannot match the empty string; it cannot appear at the beginning or end of a wildcard expression; to match an actual percent sign, the escape character \ needs to be used.

The percent sign (%) in MySQL

The percent sign (%) in MySQL is a Wildcard, used to match any sequence of characters. It can be used in the following scenarios:

1. String matching

In the LIKE clause, % can be used to match any sequence of characters:

<code class="sql">SELECT * FROM table_name WHERE column_name LIKE '%string%';</code>

This will match any record containing the string "string".

2. Range query

In the BETWEEN clause, % can be used to specify the left or right boundary of the range:

<code class="sql">SELECT * FROM table_name WHERE column_name BETWEEN '%start%' AND '%end%';</code>

This will match Records with column_name values ​​between "start" and "end" (including "start" and "end" themselves).

3. Regular expression

In the REGEXP clause, % can be used as a wildcard to match any character:

<code class="sql">SELECT * FROM table_name WHERE column_name REGEXP '%.*%';</code>

This will match the A record of any sequence of characters.

Note:

• % matches any sequence of characters, but cannot match the empty string.
• % cannot appear at the beginning or end of a wildcard expression.
• To match the actual percent sign, you need to use the escape character \, such as \%.

The above is the detailed content of What does % mean in mysql. For more information, please follow other related articles on the PHP Chinese website!