在 MySQL 中 SELECT * WHERE var == [one of many alternatives]?
mysqlmysqli database
使用 IN() 进行 select * where var== [one of many alternatives]。让我们首先创建一个表 −
mysql> create table DemoTable1624 -> ( -> ClientId int, -> ClientName varchar(20) -> ); Query OK, 0 rows affected (0.39 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1624 values(101,'Chris Brown'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable1624 values(102,'David Miller'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1624 values(103,'John Smith'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1624 values(104,'Carol Taylor'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1624 values(105,'Adam Smith'); Query OK, 1 row affected (0.19 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1624;
这将产生以下输出 −
+----------+--------------+ | ClientId | ClientName | +----------+--------------+ | 101 | Chris Brown | | 102 | David Miller | | 103 | John Smith | | 104 | Carol Taylor | | 105 | Adam Smith | +----------+--------------+ 5 rows in set (0.00 sec)
这是实现 SELECT * WHERE var == [众多替代方案之一] 的查询 −
mysql> select * from DemoTable1624 where ClientId in(101,102,104);
这将产生以下输出 −
+----------+--------------+ | ClientId | ClientName | +----------+--------------+ | 101 | Chris Brown | | 102 | David Miller | | 104 | Carol Taylor | +----------+--------------+ 3 rows in set (0.00 sec)
