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法律学使用 AND 和 OR 运算符来返回多行的 MySQL 查询
我们先创建一个表 -
mysql> create table DemoTable
(
StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
StudentName varchar(40),
StudentMathMarks int,
StudentMySQLMarks int,
status ENUM('ACTIVE','INACTIVE')
);
Query OK, 0 rows affected (0.47 sec)用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Chris',45,67,'active');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Bob',89,78,'inactive');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('David',56,68,'active');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(StudentName,StudentMathMarks,StudentMySQLMarks,status) values('Robert',68,75,'active');
Query OK, 1 row affected (0.18 sec)使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable;
会产生以下输出 -
+-----------+-------------+------------------+-------------------+----------+ | 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 和 OR 运算符返回多个行记录的查询 -
mysql> select *from DemoTable where status='active' and (StudentMathMarks=68 or StudentMySQLMarks=67);
会产生以下输出 -
+-----------+-------------+------------------+-------------------+--------+ | StudentId | StudentName | StudentMathMarks | StudentMySQLMarks | status | +-----------+-------------+------------------+-------------------+--------+ | 1 | Chris | 45 | 67 | ACTIVE | | 4 | Robert | 68 | 75 | ACTIVE | +-----------+-------------+------------------+-------------------+--------+ 2 rows in set (0.00 sec)
更新时间：2019-10-07
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