根据电子邮件地址更新 MySQL 列?
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable -> ( -> EmailAddress varchar(20), -> Score int -> ); Query OK, 0 rows affected (1.05 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('Chris@gmail.com',67);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('Robert@gmail.com',57);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('David@gmail.com',98);
Query OK, 1 row affected (0.14 sec)
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'; Query OK, 1 row affected (0.25 sec) 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)
