根据电子邮件地址更新MySQL列？
让我们首先创建一个表-
mysql> create table DemoTable -> ( -> EmailAddress varchar(20), -> Score int -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('Chris@gmail.com',67);
mysql> insert into DemoTable values('Robert@gmail.com',57);
mysql> insert into DemoTable values('David@gmail.com',98);使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+------------------+-------+ | EmailAddress | Score | +------------------+-------+ | Chris@gmail.com | 67 | | Robert@gmail.com | 57 | | David@gmail.com | 98 | +------------------+-------+ 3 rows in set (0.00 sec)
这是根据电子邮件地址更新MySQL列的查询-
mysql> update DemoTable -> set Score=89 -> where EmailAddress='Robert@gmail.com'; Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录-
mysql> select *from DemoTable;
这将产生以下输出-
+------------------+-------+ | EmailAddress | Score | +------------------+-------+ | Chris@gmail.com | 67 | | Robert@gmail.com | 89 | | David@gmail.com | 98 | +------------------+-------+ 3 rows in set (0.00 sec)