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MySQL按多列过滤？

2024-04-22 14:40:03 354

要按多列执行过滤，请使用where子句和OR。让我们首先创建一个表-

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name varchar(10),
   Score int
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(Name,Score) values('John',80);

mysql> insert into DemoTable(Name,Score) values('John',90);

mysql> insert into DemoTable(Name,Score) values('Carol',89);

mysql> insert into DemoTable(Name,Score) values('John',86);

mysql> insert into DemoTable(Name,Score) values('Carol',98);

mysql> insert into DemoTable(Name,Score) values('David',99);

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 | Name  | Score |
+----+-------+-------+
| 1  | John  | 80    |
| 2  | John  | 90    |
| 3  | Carol | 89    |
| 4  | John  | 86    |
| 5  | Carol | 98    |
| 6  | David | 99    |
+----+-------+-------+
6 rows in set (0.00 sec)

以下是执行多列过滤的查询-

mysql> select *from DemoTable where (Name,Score)=('John', 90) or (Name,Score)=('Carol', 98);

这将产生以下输出-

+----+-------+-------+
| Id | Name  | Score |
+----+-------+-------+
| 2  | John  | 90    |
| 5  | Carol | 98    |
+----+-------+-------+
2 rows in set (0.00 sec)

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MySQL按多列过滤？

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