如何将MySQL表中的所有记录从大写转换为小写?
使用UPDATE命令和LOWER()
方法将MySQL表中的所有记录从大写转换为小写。
让我们首先创建一个表-
mysql> create table DemoTable(
Id varchar(100),
StudentFirstName varchar(20),
StudentLastName varchar(20),
StudentCountryName varchar(10)
);
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('STU-101','John','Smith','US');mysql> insert into DemoTable values('STU-102','John','Doe','UK');
mysql> insert into DemoTable values('STU-103','David','Miller','AUS');
以下是使用select语句显示表中所有记录的查询-
mysql> select *from DemoTable;
这将产生以下输出-
+---------+------------------+-----------------+--------------------+| Id | StudentFirstName | StudentLastName | StudentCountryName |
+---------+------------------+-----------------+--------------------+
| STU-101 | John | Smith | US |
| STU-102 | John | Doe | UK |
| STU-103 | David | Miller | AUS |
+---------+------------------+-----------------+--------------------+
3 rows in set (0.00 sec)
这是通过一次调用更改MySQL表中每个字段大小写的查询。
mysql> update DemoTableset Id=lower(Id),
StudentFirstName=lower(StudentFirstName),
StudentLastName=lower(StudentLastName),
StudentCountryName=lower(StudentCountryName);
Rows matched: 3 Changed: 3 Warnings: 0
使用select语句显示表中的所有记录,以检查上述查询中所做的更改-
mysql> select *from DemoTable;
这将产生以下输出-
+---------+------------------+-----------------+--------------------+| Id | StudentFirstName | StudentLastName | StudentCountryName |
+---------+------------------+-----------------+--------------------+
| stu-101 | john | smith | us |
| stu-102 | john | doe | uk |
| stu-103 | david | miller | aus |
+---------+------------------+-----------------+--------------------+
3 rows in set (0.00 sec)
以上是 如何将MySQL表中的所有记录从大写转换为小写? 的全部内容, 来源链接: utcz.com/z/343395.html