MySQL에서 여러 AND 조건을 작동하는 방법은 무엇입니까?

MySQL에서 여러 AND 조건으로 작업하기 위한 구문은 다음과 같습니다. -

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

먼저 테이블을 생성하겠습니다 -

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)

삽입 명령을 사용하여 테이블에 일부 레코드 삽입 -

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)

select 문을 사용하여 테이블의 모든 레코드 표시 -

mysql> select *from DemoTable;

출력

+-----------+-------------+------------+--------------------+
| 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)

다음은 MySQL의 여러 AND 조건에 대한 쿼리입니다 -

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

출력

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