如何在 MySQL 中查詢具有給定字首的字串?
可以使用 LIKE 運算子查詢具有給定字首的字串。
語法如下
select *from yourTableName where yourColumnName LIKE 'yourPrefixValue%';
為了理解上述語法,讓我們建立一個表。建立表的查詢如下
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記錄。
查詢如下
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 語句顯示錶中的所有記錄。
查詢如下
mysql> select *from findStringWithGivenPrefixDemo;
輸出如下
+--------+-----------------------------+ | 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)
以下是如何查詢具有給定字首的字串
mysql> select *from findStringWithGivenPrefixDemo where UserMessage LIKE 'Hi%';
以下是僅顯示字首為“嗨”的字串的輸出
+--------+-----------------------------+ | UserId | UserMessage | +--------+-----------------------------+ | 1 | Hi Good Morning !!! | | 4 | Hi i am learning MongoDB!!! | +--------+-----------------------------+ 2 rows in set (0.00 sec)
廣告