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数据库第十三章课后57题(The thirteenth chapter of the database 57 questions after class)
数据库第十三章课后57题(The thirteenth chapter of the database 57 questions after class)
1 inquire about all staff information in section 20.
Select * from, EMP, where, deptno=20;
2 inquire about all types of employee numbers, employee name and department number of CLERK employees.
Select, empno, ename, deptno, from, EMP, where, job=, CLERK;
3, inquires bonus (COMM) higher than the SAL staff information.
Select * from, EMP, where, commsal;
4 query bonus 20% of employee information above salary.
Select * from, EMP, where, comm.sal*0.2;
5 enquiries about job types in department 10 for Manager and 20 employees in CLERK.
Select * from, EMP, where (job= Manager, and, deptno=10) or (job= CLERK and deptno=20)
6 inquires all types of work is not Manager and CLERK, and pay more than or equal to 2000 of the staff details.
Select * from, EMP, where (job = =MANAGER, or, job=,CLERK) and sal=2000
7 inquire about different types of employees with bonuses.
Select, job, from, EMP, where, comm.0, group, by, job
8 check all employee salaries and bonuses and.
Select, ename, sal+nvl (comm, 0), from, EMP
9 query no bonus or bonus less than 100 employee information.
Select *, from, EMP, where (comm, is, null) or comm 100
10 inquire about employee information of last second days.
Select, ename, hiredate, from, EMP, where, last_day (hiredate) -hiredate=1
11 enquiries about employees whose seniority is greater than or equal to 10 years.
Select * from, EMP, where, months_between (sysdate, hiredate) /25/12=1
12 inquire about employee information and ask to display all employees names in initial letters.
Select initcap (ename) from EMP
13 query employee name information for employees with exactly 6 characters.
Select, ename, from, EMP, where, length (ename) =6
14 employees who dont include the letter S in their employee name.
Select * from, EMP, where, ename, not, like,%S%
15 query employee name for second letter M employee information.
Select * from, EMP, where, ename, like,_M%
16 query the first three c
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