MySQL在一个查询中更新多个记录？
让我们首先创建一个表-
mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Marks1 int, -> Marks2 int, -> Marks3 int -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(Marks1,Marks2,Marks3) values(45,67,34); mysql> insert into DemoTable(Marks1,Marks2,Marks3) values(89,87,56); mysql> insert into DemoTable(Marks1,Marks2,Marks3) values(87,56,54);
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-
+----+--------+--------+--------+ | Id | Marks1 | Marks2 | Marks3 | +----+--------+--------+--------+ | 1 | 45 | 67 | 34 | | 2 | 89 | 87 | 56 | | 3 | 87 | 56 | 54 | +----+--------+--------+--------+ 3 rows in set (0.00 sec)
这是更新多个记录的查询-
mysql> update DemoTable -> set Marks1=98,Marks2=96,Marks3=99 -> where Id=1; 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-
+----+--------+--------+--------+ | Id | Marks1 | Marks2 | Marks3 | +----+--------+--------+--------+ | 1 | 98 | 96 | 99 | | 2 | 89 | 87 | 56 | | 3 | 87 | 56 | 54 | +----+--------+--------+--------+ 3 rows in set (0.00 sec)