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。创建表的查询如下
mysql> create table findStringWithGivenPrefixDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserMessage text -> );
使用insert命令在表中插入一些记录。
查询如下
mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hi Good Morning !!!'); mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hey I am busy!!'); mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hello what are you doing!!!'); mysql> insert into findStringWithGivenPrefixDemo(UserMessage) values('Hi I am learning MongoDB!!!');
使用select语句显示表中的所有记录。
查询如下
mysql> select *from findStringWithGivenPrefixDemo;
以下是输出
+--------+-----------------------------+ | 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)
这是查找具有给定前缀的字符串的查询
mysql> select *from findStringWithGivenPrefixDemo where UserMessage LIKE 'Hi%';
以下是仅显示前缀为“ Hi”的字符串的输出
+--------+-----------------------------+ | UserId | UserMessage | +--------+-----------------------------+ | 1 | Hi Good Morning !!! | | 4 | Hi i am learning MongoDB!!! | +--------+-----------------------------+ 2 rows in set (0.00 sec)