更新MySQL中的所有行，并删除字符串中及其周围的所有不必要的空格？
要删除不必要的空格，请TRIM()在MySQL中使用。让我们首先创建一个-
mysql> create table DemoTable1405 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> );
使用insert在表中插入一些记录-
mysql> insert into DemoTable1405 values(' Chris',' Brown ');
mysql> insert into DemoTable1405 values('David ',' Miller ');
mysql> insert into DemoTable1405 values(' Carol ',' Taylor ');使用选择显示表中的所有记录-
mysql> select * from DemoTable1405;
这将产生以下输出-
+------------------+----------------+ | FirstName | LastName | +------------------+----------------+ | Chris | Brown | | David | Miller | | Carol | Taylor | +------------------+----------------+ 3 rows in set (0.00 sec)
以下是删除所有不必要的空格并更新所有行的查询-
mysql> update DemoTable1405 set FirstName=trim(FirstName),LastName=trim(LastName); Rows matched: 3 Changed: 3 Warnings: 0
让我们再次检查表记录-
mysql> select * from DemoTable1405;
这将产生以下输出-
+-----------+----------+ | FirstName | LastName | +-----------+----------+ | Chris | Brown | | David | Miller | | Carol | Taylor | +-----------+----------+ 3 rows in set (0.00 sec)