<SQLD 4> between .. and 연산자를 사용법에 대한 기출문제

 

매일 SQLD 기출 문제 풀기 챌린지

 

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문제4.

다음 주어진 SQL문과 동일한 결과값을 반환하는 SQL문으로 올바른 것은?

SELECT * FROM EMP
WHERE SAL BETWEEN 1000 AND 3000;

 

① SELECT * FROM EMP

WHERE SAL >= 1000 AND SAL <= 3000

② SELECT * FROM EMP

WHERE SAL <= 1000 AND SAL >= 3000

③ SELECT * FROM EMP

WHERE SAL >= 1000 OR SAL <= 3000

④ SELECT * FROM EMP

WHERE SAL <= 1000 OR SAL <= 3000

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해설해보기

between A and B : A와 B 포함하고, 그 사이의 값을 의미함

따라서
1000과 3000을 포함한 사이의 값을 출력하는 것이 조건이기 때문에
OR와 AND 중 AND를 사용해야함.

OR을 사용하면 1000이상인 값 또는 3000이하인 값을 의미하여 4000과 500도 출력됨.

따라서 정답은
① 

 

직접 실행해보기

 

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관련 스크립트

- 관련 스크립트 -

alter session set nls_Date_format='RR/MM/DD';
drop table emp;
drop table dept;


CREATE TABLE DEPT
       (DEPTNO number(10),
        DNAME VARCHAR2(14),
        LOC VARCHAR2(13) );


INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO DEPT VALUES (20, 'RESEARCH',   'DALLAS');
INSERT INTO DEPT VALUES (30, 'SALES',      'CHICAGO');
INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');

CREATE TABLE EMP (
 EMPNO               NUMBER(4) NOT NULL,
 ENAME               VARCHAR2(10),
 JOB                 VARCHAR2(9),
 MGR                 NUMBER(4) ,
 HIREDATE            DATE,
 SAL                 NUMBER(7,2),
 COMM                NUMBER(7,2),
 DEPTNO              NUMBER(2) );


INSERT INTO EMP VALUES (7839,'KING','PRESIDENT',NULL,'81-11-17',5000,NULL,10);
INSERT INTO EMP VALUES (7698,'BLAKE','MANAGER',7839,'81-05-01',2850,NULL,30);
INSERT INTO EMP VALUES (7782,'CLARK','MANAGER',7839,'81-05-09',2450,NULL,10);
INSERT INTO EMP VALUES (7566,'JONES','MANAGER',7839,'81-04-01',2975,NULL,20);
INSERT INTO EMP VALUES (7654,'MARTIN','SALESMAN',7698,'81-09-10',1250,1400,30);
INSERT INTO EMP VALUES (7499,'ALLEN','SALESMAN',7698,'81-02-11',1600,300,30);
INSERT INTO EMP VALUES (7844,'TURNER','SALESMAN',7698,'81-08-21',1500,0,30);
INSERT INTO EMP VALUES (7900,'JAMES','CLERK',7698,'81-12-11',950,NULL,30);
INSERT INTO EMP VALUES (7521,'WARD','SALESMAN',7698,'81-02-23',1250,500,30);
INSERT INTO EMP VALUES (7902,'FORD','ANALYST',7566,'81-12-11',3000,NULL,20);
INSERT INTO EMP VALUES (7369,'SMITH','CLERK',7902,'80-12-09',800,NULL,20);
INSERT INTO EMP VALUES (7788,'SCOTT','ANALYST',7566,'82-12-22',3000,NULL,20);
INSERT INTO EMP VALUES (7876,'ADAMS','CLERK',7788,'83-01-15',1100,NULL,20);
INSERT INTO EMP VALUES (7934,'MILLER','CLERK',7782,'82-01-11',1300,NULL,10);


commit;