所创造的一切EMPLOYEE
S.
将显示在NAME,JOB,DEPARTMENT NAME,SALARY
和GRADE
(从SALGRADE
表)查询MY CODE SO FAR GIVES OUTPUT
select e.ename, e.job, d.dname, e.sal, s.grade
from emp e, dept d, salgrade s
where e.deptno = d.deptno
这将返回70行,但结果应该只产生14行。
EMPLOYEE EMP JOB DEPT NAME EMP SALARY SALARY GRADE
---------- --------- -------------- ---------- ------------
JAMES CLERK SALES 950 1
SMITH CLERK RESEARCH 800 1
ADAMS CLERK RESEARCH 1100 1
MARTIN SALESMAN SALES 1250 2
WARD SALESMAN SALES 1250 2
MILLER CLERK ACCOUNTING 1300 2
ALLEN SALESMAN SALES 1600 3
TURNER SALESMAN SALES 1500 3
BLAKE MANAGER RESEARCH 2850 4
CLARK MANAGER ACCOUNTING 2450 4
JONES MANAGER RESEARCH 2975 4
FORD ANALYST RESEARCH 3000 4
SCOTT ANALYST RESEARCH 3000 4
KING PRESIDENT ACCOUNTING 5000 5
emp
表有empno, ename, job, deptno, comm, sal
salgrade
表已经grade
DEPT
表已经deptno, loc
请帮助只有14行应选择
无需使用大写字母! – Benoit
哪里缺少表salgrade中的链接? – JellyBelly