SELECT * WHERE var == [MySQL中的许多替代方法之一]？
使用IN()了SELECT*其中var==[众多选择之一。让我们首先创建一个表-
mysql> create table DemoTable1624
-> (
-> ClientId int,
-> ClientName varchar(20)
-> );使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1624 values(101,'Chris Brown'); mysql> insert into DemoTable1624 values(102,'David Miller'); mysql> insert into DemoTable1624 values(103,'John Smith'); mysql> insert into DemoTable1624 values(104,'Carol Taylor'); mysql> insert into DemoTable1624 values(105,'Adam Smith');
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*WHEREvar==[许多替代方法之一]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)