MySQL查询使用AND＆OR运算符返回多行记录
让我们首先创建一个表-
create table DemoTable
(
StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
StudentName varchar(40),
StudentMathMarks int,
StudentMySQLMarks int,
status ENUM('ACTIVE','INACTIVE')
);使用插入命令在表中插入一些记录-
insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Chris',45,67,'active');
insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Bob',89,78,'inactive');
insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('David',56,68,'active');
insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Robert',68,75,'active');使用select语句显示表中的所有记录-
select *from DemoTable;
这将产生以下输出-
+-----------+-------------+------------------+-------------------+----------+ | StudentId | StudentName | StudentMathMarks | StudentMySQLMarks | status | +-----------+-------------+------------------+-------------------+----------+ | 1 | Chris | 45 | 67 | ACTIVE | | 2 | Bob | 89 | 78 | INACTIVE | | 3 | David | 56 | 68 | ACTIVE | | 4 | Robert | 68 | 75 | ACTIVE | +-----------+-------------+------------------+-------------------+----------+ 4 rows in set (0.00 sec)
以下是使用AND＆OR运算符返回多个行记录的查询-
select *from DemoTable where status='active' and (StudentMathMarks=68 or StudentMySQLMarks=67);
这将产生以下输出-
+-----------+-------------+------------------+-------------------+--------+ | StudentId | StudentName | StudentMathMarks | StudentMySQLMarks | status | +-----------+-------------+------------------+-------------------+--------+ | 1 | Chris | 45 | 67 | ACTIVE | | 4 | Robert | 68 | 75 | ACTIVE | +-----------+-------------+------------------+-------------------+--------+ 2 rows in set (0.00 sec)