MySQL 查询以从表中查找替代记录
mysqlmysqli database
要从表中查找替代记录，您需要使用 OR 条件，如以下语法所示 −
select *from yourTableName where yourColumnName=yourValue1 OR yourColumnName=yourValue2…...N;
首先我们创建一个表 −
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)
使用 insert 命令在表中插入一些记录 −
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 select 语句显示表中的所有记录 −
mysql> select *from DemoTable772;
这将产生以下输出 -
+----+--------+------+ | 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)
这是 MySQL 的查询，或者 −
mysql> select *from DemoTable772 where Id=2 OR Id=4 OR Id=6;
这将产生以下输出 -
+----+--------+------+ | Id | Name | Age | +----+--------+------+ | 2 | Robert | 26 | | 4 | Sam | 24 | | 6 | David | 25 | +----+--------+------+ 3 rows in set (0.01 sec)
