MySQL 查询中查找表中备选记录


要从一张表中查找备选记录,你需要使用 OR 条件,如下面的语法所示 −

select *from yourTableName where yourColumnName=yourValue1 OR yourColumnName=yourValue2…...N;

让我们首先创建一个表 −

mysql> create table DemoTable772 (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name varchar(100),
   Age int
);
Query OK, 0 rows affected (0.76 sec)

对表插入一些记录,使用插入命令 −

mysql> insert into DemoTable772(Name,Age) values('Chris',21);
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable772(Name,Age) values('Robert',26);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable772(Name,Age) values('Mike',27);
Query OK, 1 row affected (0.35 sec)
mysql> insert into DemoTable772(Name,Age) values('Sam',24);
Query OK, 1 row affected (0.45 sec)
mysql> insert into DemoTable772(Name,Age) values('Carol',28);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable772(Name,Age) values('David',25);
Query OK, 1 row affected (0.93 sec)

使用选择语句显示表中的所有记录 −

mysql> select *from DemoTable772;

将产生以下输出 -

+----+--------+------+
| Id | Name   | Age  |
+----+--------+------+
|  1 | Chris  | 21   |
|  2 | Robert | 26   |
|  3 | Mike   | 27   |
|  4 | Sam    | 24   |
|  5 | Carol  | 28   |
|  6 | David  | 25   |
+----+--------+------+
6 rows in set (0.00 sec)

以下是 MySQL OR 查询 −

mysql> select *from DemoTable772 where Id=2 OR Id=4 OR Id=6;

将产生以下输出 -

+----+--------+------+
| Id | Name   | Age  |
+----+--------+------+
|  2 | Robert | 26   |
|  4 | Sam    | 24   |
|  6 | David  | 25   |
+----+--------+------+
3 rows in set (0.01 sec)

更新日期: 03-9 月-2019

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