MySQL 选择查询包含多个 WHERE?
mysqlmysqli database
要实现多个 WHERE，请使用 IN() IN MySQL。
以下是语法:
select *from yourTableName where yourColumnName IN(yourValue1,yourValue2,...N);
让我们首先创建一个表 -
mysql> create table DemoTable ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.61 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values(10,'John'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(59,'Carol'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(20,'Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(45,'David'); Query OK, 1 row affected (0.73 sec)
使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable;
输出
+------+-------+ | Id | Name | +------+-------+ | 10 | John | | 59 | Carol | | 20 | Sam | | 45 | David | +------+-------+ 4 rows in set (0.00 sec)
以下是实现多个 WHERE 的查询 -
mysql> select *from DemoTable where Id IN(59,45);
输出
+------+-------+ | Id | Name | +------+-------+ | 59 | Carol | | 45 | David | +------+-------+ 2 rows in set (0.14 sec)
