数据库第十三章课后57题（The thirteenth chapter of the database 57 questions after class）.doc

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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）.doc

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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