如何在 MySQL 中查找具有给定前缀的字符串?
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 -> ); Query OK, 0 rows affected (0.82 sec)
使用插入命令在表中插入一些记录。
查询如下
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 语句显示表中的所有记录。
查询如下
mysql> select *from findStringWithGivenPrefixDemo;
输出如下
+--------+-----------------------------+ | 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)
以下是如何查找具有给定前缀的字符串
mysql> select *from findStringWithGivenPrefixDemo where UserMessage LIKE 'Hi%';
以下是仅显示前缀为“嗨”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)
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