如何在单个MySQL查询中使用三个条件（ID，学生的姓名和年龄）来获取学生的记录？
让我们首先创建一个表-
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(50), StudentAge int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(StudentName,StudentAge) values('Chris',21);
mysql> insert into DemoTable(StudentName,StudentAge) values('David',23);
mysql> insert into DemoTable(StudentName,StudentAge) values('Bob',22);
mysql> insert into DemoTable(StudentName,StudentAge) values('Carol',21);使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出＆minusl;。
+-----------+-------------+------------+ | StudentId | StudentName | StudentAge | +-----------+-------------+------------+ | 1 | Chris | 21 | | 2 | David | 23 | | 3 | Bob | 22 | | 4 | Carol | 21 | +-----------+-------------+------------+ 4 rows in set (0.00 sec)
以下是实现三个条件以获取特定记录的查询-
mysql> select *from DemoTable where StudentId=4 and StudentName='Carol' and StudentAge=21;
这将产生以下输出-
+-----------+-------------+------------+ | StudentId | StudentName | StudentAge | +-----------+-------------+------------+ | 4 | Carol | 21 | +-----------+-------------+------------+ 1 row in set (0.00 sec)