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?
mysqlmysqli database更新于 2024/3/8 18:21:00
要删除不必要的空格，请在 MySQL 中使用 TRIM()。让我们首先创建一个 −
mysql> create table DemoTable1405 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.55 sec)
使用 insert 在表中插入一些记录 −
mysql> insert into DemoTable1405 values(' Chris',' Brown ');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable1405 values('David ',' Miller ');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable1405 values(' Carol ',' Taylor ');
Query OK, 1 row affected (0.19 sec)
使用 select 语句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)
以下查询用于删除所有不必要的空格并更新所有行 −
mysql> update DemoTable1405 set FirstName=trim(FirstName),LastName=trim(LastName); Query OK, 3 rows affected (0.18 sec) 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)
