MySQL更新查询删除空格?
您可以使用TRIM()
函数删除空格。语法如下-
UPDATE yourTableName SET yourColumnName=TRIM(yourColumnName);
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 removeSpaceDemo-> (
-> Id int NOT NULL AUTO_INCREMENT,
-> UserId varchar(20),
-> UserName varchar(10),
-> PRIMARY KEY(Id)
-> );
使用insert命令在表中插入一些记录。查询如下-
mysql> insert into removeSpaceDemo(UserId,UserName) values('John1267 ','John');mysql> insert into removeSpaceDemo(UserId,UserName) values(' 12Larry56','Larry');
mysql> insert into removeSpaceDemo(UserId,UserName) values(' David909','David');
mysql> insert into removeSpaceDemo(UserId,UserName) values('Bob912 ','Bob');
mysql> insert into removeSpaceDemo(UserId,UserName) values(' Sam123 ','Sam');
现在,您可以使用select语句显示表中的所有记录。查询如下-
mysql> select *from removeSpaceDemo;
以下是显示带空格的记录的输出:
+----+----------------+----------+| Id | UserId | UserName |
+----+----------------+----------+
| 1 | John1267 | John |
| 2 | 12Larry56 | Larry |
| 3 | David909 | David |
| 4 | Bob912 | Bob |
| 5 | Sam123 | Sam |
+----+----------------+----------+
5 rows in set (0.00 sec)
这是删除空格的查询-
mysql> update removeSpaceDemo set UserId=TRIM(UserId);Rows matched: 5 Changed: 5 Warnings: 0
现在再次检查表记录。查询如下-
mysql> select *from removeSpaceDemo;
以下是输出-
+----+-----------+----------+| Id | UserId | UserName |
+----+-----------+----------+
| 1 | John1267 | John |
| 2 | 12Larry56 | Larry |
| 3 | David909 | David |
| 4 | Bob912 | Bob |
| 5 | Sam123 | Sam |
+----+-----------+----------+
5 rows in set (0.00 sec)
您也可以使用RTRIM()
方法代替TRIM()
。语法如下-
UPDATE yourTableName SET yourColumnName=RTRIM(yourColumnName);
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