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法学研究如何在 MySQL 中处理多个 AND 条件?
要在 MySQL 中使用多个 AND 条件，语法如下 −
select *from yourTableName where yourColumnName1=yourValue1 and yourColumnName2=yourValue2 and yourColumnName3=yourValue3;
我们先创建一个表 −
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 命令向表中插入一些记录 −
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 语句从表中显示所有记录 −
mysql> select *from DemoTable;
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 中针对多个 AND 条件的查询 −
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)
更新于: 2019 年 7 月 30 日
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