如何在MySQL中使用多个AND条件？

要在MySQL中使用多个AND条件，请按照以下语法操作 −

select *from yourTableName where yourColumnName1=yourValue1 and yourColumnName2=yourValue2 and yourColumnName3=yourValue3;

让我们首先创建一个表 −

mysql> create table DemoTable
  (
  StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
  StudentName varchar(20),
  StudentAge int,
  StudentCountryName varchar(40)
);
Query OK, 0 rows affected (0.59 sec)

使用insert命令在表中插入一些记录 −

mysql> insert into DemoTable(StudentName,StudentAge,StudentCountryName) values('John',23,'US');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName,StudentAge,StudentCountryName) values('Carol',21,'UK');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(StudentName,StudentAge,StudentCountryName) values('John',21,'US');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(StudentName,StudentAge,StudentCountryName) values('John',21,'AUS');
Query OK, 1 row affected (0.14 sec)

使用select语句显示表中的所有记录 −

mysql> select *from DemoTable;

阅读更多：MySQL 教程

输出

+-----------+-------------+------------+--------------------+
| StudentId | StudentName | StudentAge | StudentCountryName |
+-----------+-------------+------------+--------------------+
| 1         | John        | 23         | US                 |
| 2         | Carol       | 21         | UK                 |
| 3         | John        | 21         | US                 |
| 4         | John        | 21         | AUS                |
+-----------+-------------+------------+--------------------+
4 rows in set (0.00 sec)

以下是MySQL中多个AND条件的查询语句−

mysql> select *from DemoTable where StudentName="John" and StudentAge=21 and StudentCountryName="AUS";

输出

+-----------+-------------+------------+--------------------+
| StudentId | StudentName | StudentAge | StudentCountryName |
+-----------+-------------+------------+--------------------+
| 4         | John        | 21         | AUS                |
+-----------+-------------+------------+--------------------+
1 row in set (0.00 sec)