What is the symbol that represents all columns in sql

The symbol in sql that represents all columns is the % in the wildcard character. Wildcard characters can be used to replace any other character in a string to search for data in a table. Used with the LIKE operator in SQL.

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

Wildcard characters can be used to replace any other characters in a string.

SQL Wildcards

In SQL, wildcards are used with the SQL LIKE operator.

SQL wildcards are used to search for data in a table.

In SQL, you can use the following wildcards:

Example:

mysql> SELECT * FROM Websites;
+----+---------------+---------------------------+-------+---------+
| id | name          | url                       | alexa | country |
+----+---------------+---------------------------+-------+---------+
|  1 | Google        | https://www.google.cm/    |     1 | USA     |
|  2 | 淘宝          | https://www.taobao.com/   |    13 | CN      |
|  3 | 菜鸟教程      | http://www.runoob.com/    |  5000 | USA     |
|  4 | 微博          | http://weibo.com/         |    20 | CN      |
|  5 | Facebook      | https://www.facebook.com/ |     3 | USA     |
|  7 | stackoverflow | http://stackoverflow.com/ |     0 | IND     |
+----+---------------+---------------------------+-------+---------+

Use SQL % wildcards

Below The SQL statement selects all websites whose URL starts with the letters "https":

SELECT * FROM Websites
WHERE url LIKE 'https%';

Execution output result:

Related recommendations: "mysql tutorial 》

The above is the detailed content of What is the symbol that represents all columns in sql. For more information, please follow other related articles on the PHP Chinese website!