먼저 테이블을 생성하겠습니다 -
mysql> create table DemoTable ( Title text ); Query OK, 0 rows affected (0.39 sec)
삽입 명령을 사용하여 테이블에 일부 레코드 삽입 -
mysql> insert into DemoTable values('Introduction to MySQL'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Introduction to Java'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Introduction to SQL'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Introduction to Python'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Introduction to SQL'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Introduction to Java'); Query OK, 1 row affected (0.13 sec)
select 문을 사용하여 테이블의 모든 레코드 표시 -
mysql> select *from DemoTable;
이것은 다음과 같은 출력을 생성합니다 -
+------------------------+ | Title | +------------------------+ | Introduction to MySQL | | Introduction to Java | | Introduction to SQL | | Introduction to Python | | Introduction to SQL | | Introduction to Java | +------------------------+ 6 rows in set (0.00 sec)
다음은 MySQL에서 HAVING LENGTH(field)를 구현하는 쿼리입니다 -
mysql> select *from DemoTable group by length(Title) having length(Title) < 21;
이것은 다음과 같은 출력을 생성합니다 -
+----------------------+ | Title | +----------------------+ | Introduction to SQL | | Introduction to Java | +----------------------+ 2 rows in set (0.00 sec)