MySQL 如何查找具有给定前缀的字符串
您可以使用LIKE运算符查找具有给定前缀的字符串。
语法如下:
select *from yourTableName where yourColumnName LIKE 'yourPrefixValue%';
为了理解上述语法,让我们创建一个表。创建表的查询语句如下所示:
mysql> create table findStringWithGivenPrefixDemo
-> (
-> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> UserMessage text
-> );
Query OK, 0 rows affected (0.82 sec)
使用插入命令在表中插入一些记录。
查询语句如下所示:
mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hi Good Morning !!!');
Query OK, 1 row affected (0.17 sec)
mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hey I am busy!!');
Query OK, 1 row affected (0.20 sec)
mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hello what are you doing!!!');
Query OK, 1 row affected (0.47 sec)
mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hi I am learning MongoDB!!!');
Query OK, 1 row affected (0.15 sec)
使用select语句从表中显示所有记录。
查询语句如下所示:
mysql> select *from findStringWithGivenPrefixDemo;
以下是输出结果:
+--------+-----------------------------+
| UserId | UserMessage |
+--------+-----------------------------+
| 1 | Hi Good Morning !!! |
| 2 | Hey I am busy!! |
| 3 | Hello what are you doing!!! |
| 4 | Hi I am learning MongoDB!!! |
+--------+-----------------------------+
4 rows in set (0.00 sec)
以下是查找具有给定前缀的字符串的查询语句:
mysql> select *from findStringWithGivenPrefixDemo where UserMessage LIKE 'Hi%';
以下是仅显示以前缀“Hi”开头的字符串的输出结果:
+--------+-----------------------------+
| UserId | UserMessage |
+--------+-----------------------------+
| 1 | Hi Good Morning !!! |
| 4 | Hi i am learning MongoDB!!! |
+--------+-----------------------------+
2 rows in set (0.00 sec)
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