Here I am sharing the set of SQL Queries with Answers which I have prepared. Working in OBIEE and in database It is good know about the basic SQL query.
1. Display the dept information from department table.
Select * from dept;
2. Display the details of all employees
Select * from emp;
3. Display the name and job for all employees
Select ename ,job from emp;
4. Display name and salary for all employees.
Select ename , sal from emp;
5. Display employee number and total salary for each employee.
Select empno, sal+comm From emp;
6. Display employee name and annual salary for all employees.
Select empno,empname,12*sal+nvl(comm,0) annualsal from emp;
7. Display the names of all employees who are working in department number 10
Select ename from emp where deptno=10;
8. Display the names of all employees working as clerks and drawing a salary more than 3000
Select ename from emp where job=’clerk’andsal>3000;
9. Display employee number and names for employees who earn commission
Select empno,ename from emp where comm is not null and comm>0.
10. Display names of employees who do not earn any commission.
Select empno ,ename from emp where comm is null and comm=0.
11. Display the names of employees who are working as clerk,salesman or anlyst and drawing a salary more than 3000.
Select ename from emp where(job=’clerk’or job=’salesman’ or job= ‘Analyst’) and sal>3000;
(Or)
Select ename from emp wherejob in(‘clerk’,’slaesman’,’analyst’) and sal>3000;
12. Display the names of employees who are working in the company for the past 5 years.
Select ename from emp where sysdate-hiredate>5*365;
13. Display the list of employees who have joined the company before
30th June 90 after 31st dec 90.
Select * from emp where hiredate between ’30-Jun-1990’ and ’31-dec-1990’;
14. Display current date.
Select sysdate from dual;
15. Display the list of users in your database(using log table).
Select * from dba_users;
16. Display the names of all tables from the current user.
Select * from tab;
17. Display the name of the Current user.
Show user;
18. Display the names of employees working in department number 10 or 20 or 40 employees working as clerks.salesman or analyst
Select ename from emp where deptno in(10,20,40) or job in(‘clerks’,’salesman’,’Analyst’);
19. Display the names of employees whose name starts with alphabet S.
Select ename from emp where ename like ‘S%’;
20. Display the names of employees whose name ends with alphabet S.
Select ename from emp where ename like ‘%S’;
21. Display the names of employees whose name have second alphabet A in their names.
Select ename from emp where ename like ‘_A%’;
22. Display the names of employees whose name is exactly five characters in length.
Select ename from emp where length(ename)=5;
(Or)
Select ename from emp where ename like ‘_____’;
23. Display the names of employees who are not working as managers.
Select * from emp minus(Select * from emp where empno in(Select mgr from emp));
(Or)
Select * from emp e where empno not in (Select mgr from emp where mgr is not null);
(Or)
Select * from emp e where empno not in (Select mgr from emp where e.empno=mgr);
24. Display the names of employees who are not working as SALESMAN or CLERK or ANALYST.
Select ename from emp where job not in(‘clerks’,’salesman’,’Analyst’);
25. Display all rows from Emp table .The System should wait after every screen full of information.
Set pause on;
26.Display the total number of employees working in the company.
27. Display the total salary being paid to all employees.
28. Display the maximum salary from emp table.
29. Display the minimum salary from emp table.
30. Display the average salary from emp table.
31. Display the maximum salary being paid to CLERK.
32. Display the maximum salary being paid in dept no 20.
33. Display the min salary being paid to any SALESMAN
34. Display the average salary drawn by managers.
35. Display the total salary drawn by analyst working in dept no 40.
36. Display the names of employees in order of salary i.e. the name of the employee earning lowest salary should appear first.
37. Display the names of employees in descending order of salary
38. Display the details from emp table in order of emp name.
39. Display empno,ename,deptno and sal .Sort the output first based on name and within name by deptno and withindeptno by sal;
40. Display the name of the employee along with their annual salary (sal*12).The name of the employee earning highest annual salary should appear first.
41. Display name ,Sal,hra,pf,da,total sal for each employee.The Output should be in the order of total sal, hra 15% of sal , da 10% of sal , pf 5% of sal total salary will be (sal*hra*da)-pf.
42. Display dept numbers and total number of employees within each group.
43. Display the various jobs and total number of employees with each job group.
44. Display department numbers and total salary for each department.
45. Display department numbers and maximum salary for each department.
46. Display the various jobs and total salary for each job.
47. Display each jobs along with minimum sal being paid in each job group.
48.Display the department numbers with more than three employees in each dept.
49. Display the various jobs along with total sal for each of the jobs where total sal is greater than 40000
50. Display the various jobs along with total number of employee in each job.the output should contain only those jobs with more than three employees.
Select count(*) from emp;
27. Display the total salary being paid to all employees.
Select sum(sal)+sum(nvl(comm.,0)) form emp;
28. Display the maximum salary from emp table.
Select max(sal ) from emp;
29. Display the minimum salary from emp table.
Select min(sal) from emp;
30. Display the average salary from emp table.
Select avg(sal) from emp;
31. Display the maximum salary being paid to CLERK.
Select max(sal ) from emp where job=’clerk’;
32. Display the maximum salary being paid in dept no 20.
Select max(sal ) from emp where deptno=20;
33. Display the min salary being paid to any SALESMAN
Select max(sal ) from emp where job=’ SALESMAN’;
34. Display the average salary drawn by managers.
Select avg(sal) from emp where job=’MANAGER’;
35. Display the total salary drawn by analyst working in dept no 40.
Select sum(sal)+sum(nvl(comm,0)) from emp where deptno=40;
36. Display the names of employees in order of salary i.e. the name of the employee earning lowest salary should appear first.
Select ename from emp order by sal;
37. Display the names of employees in descending order of salary
Select ename from emp order by sal desc;
38. Display the details from emp table in order of emp name.
Select ename from emp order by ename;
39. Display empno,ename,deptno and sal .Sort the output first based on name and within name by deptno and withindeptno by sal;
Select * from emp order byename,deptno,sal;
40. Display the name of the employee along with their annual salary (sal*12).The name of the employee earning highest annual salary should appear first.
Select ename,12*(sal+nvl(comm,0)) Annual from emp order by 12*(sal+nvl(comm,0)) desc;
41. Display name ,Sal,hra,pf,da,total sal for each employee.The Output should be in the order of total sal, hra 15% of sal , da 10% of sal , pf 5% of sal total salary will be (sal*hra*da)-pf.
Select ename,sal,sal*15/100 HRA, SAL*5/100 pf,SAL*10/100 da,sal+sal*15/100-sal*5/100 Total_SALARY from emp
42. Display dept numbers and total number of employees within each group.
Select deptno,count(*) from emp group by deptno;
43. Display the various jobs and total number of employees with each job group.
Select job,count(*) from emp group by job;
44. Display department numbers and total salary for each department.
Select deptno, sum(sal) from emp group by deptno;
45. Display department numbers and maximum salary for each department.
Select deptno, max(sal) from emp group by deptno;
46. Display the various jobs and total salary for each job.
Select job, sum(sal) from emp group by job;
47. Display each jobs along with minimum sal being paid in each job group.
Select job,min(sal) from emp group by job;
48.Display the department numbers with more than three employees in each dept.
Select deptno,count(*) from emp group by deptno having count(*)>3;
49. Display the various jobs along with total sal for each of the jobs where total sal is greater than 40000
Select job, sum(sal) from emp group by job having sum(sal)>40000;
50. Display the various jobs along with total number of employee in each job.the output should contain only those jobs with more than three employees.
Select job,count(*) from emp group by job having count(*)>3.
51. Display the name of emp who earns highest sal.
52. Display the employee number and name of employee working as CLERK and earning highest salary among CLERKS.
53. Display the name of the salesman who earns a salary more than the highest salary of any clerk.
54. Display the names of clerks who earn salary more than that of Jame sof that of sal lesser than that of Scott.
55. Display the names of employees who earn a Sal more than that of James or that of salary greater than that of Scott.
56. Display the names of employees who earn highest salary in their respective departments.
57. Display the names of employees who earn highest salary in their respective job groups.
58. Display the employee names who are working in accountings dept.
59. Display the employee names who are working in CHICAGO.
60. Display the job groups having total salary greater than the maximum salary for managers.
61. Display the names of employee from department number 10 with slary greater than that of all employee working in other departments.
62. Display the name of employees in Uppercase
63. Display the name of employees in Lower case
64. Find out the length of your name using appropriate function.
65. Display the length of all employees names.
66. Display the name of the employee concatenate with empno
67. Use appropriate function and extract 3 characters staring from 2 characters from the following string‘Oracle’ i.e the output should be ‘rac’.
68.Find the first occurrence of character a from the following string ‘computer maintenance corporation’.
69. Repalce every occurrence of alphabet A with B in the string Allen’s(user translate function).
70. Display the information from emp table.Wherever job ‘manager’ is found it should be diaplayed as boss(replace function).
71. Display empnoo,ename,deptno from emp table .Instead of display department numbers display the related department name (use decode function).
72. Display your age in days.
73. Display ypur age in months.
74. Display current date as 15th august Friday nineteen forty seven.
75. Display the following output for each row from emp table as ‘scott has joined the company on Wednesday 13th august nineteen ninety’.
Select ename from emp where sal=(select max(sal) from emp);
52. Display the employee number and name of employee working as CLERK and earning highest salary among CLERKS.
Select empno,ename from emp where job=’CLERK’ and sal=(select max(sal) from emp where job=’CLERK’);
53. Display the name of the salesman who earns a salary more than the highest salary of any clerk.
Select ename from emp where job=’salesman’ and sal>(select max(sal) from emp where job=’clerk’);
54. Display the names of clerks who earn salary more than that of Jame sof that of sal lesser than that of Scott.
Select ename from emp where job=’clerk’ and sal<(select sal from emp where ename =’scott’) and sal>(select sal from emp where ename=’james’);
55. Display the names of employees who earn a Sal more than that of James or that of salary greater than that of Scott.
Select ename from emp where sal<(select sal from emp where ename=’Scott’)And sal>(select sal from emp where ename=’James’);
56. Display the names of employees who earn highest salary in their respective departments.
Select * from emp e where sal =(select max(sal) form emp where deptno=e.deptno)
57. Display the names of employees who earn highest salary in their respective job groups.
Select * from emp e where sal in(select max(sal) form emp group by having e.job=job).
58. Display the employee names who are working in accountings dept.
Select ename from emp where deptno=(select deptn0 from dept where dname=’ACCOUNTING’);
(OR)
Select ename from emp where deptno IN(select deptn0 from dept where dname=’ACCOUNTING’);
59. Display the employee names who are working in CHICAGO.
Select ename from emp where deptno=(select deptno from dept where loc=’CHICAGO’);
60. Display the job groups having total salary greater than the maximum salary for managers.
Select job,sum(sal) form emp group by job having sum(sal)>(select max(sal) from emp where job=’MANAGERS’;
61. Display the names of employee from department number 10 with slary greater than that of all employee working in other departments.
Select ename ,sal ,deptno from emp e where deptno=10 and sal>any(select sal from emp where e.deptno!=deptno);
62. Display the name of employees in Uppercase
Select upper(ename) from emp;
63. Display the name of employees in Lower case
Select lower(ename) from emp;
64. Find out the length of your name using appropriate function.
Select length(‘India’) from dual;
65. Display the length of all employees names.
Select sum( length(ename)) from emp;
66. Display the name of the employee concatenate with empno
Select ename|| empno from emp;
(or)
Select concat(ename,empno) from emp;
67. Use appropriate function and extract 3 characters staring from 2 characters from the following string‘Oracle’ i.e the output should be ‘rac’.
Select substr(‘oracle’,’2’3) from dual;
68.Find the first occurrence of character a from the following string ‘computer maintenance corporation’.
Select instr(‘computer maintenance corporation’,’a’,1,1) from dual;
69. Repalce every occurrence of alphabet A with B in the string Allen’s(user translate function).
Select replace(‘Allens’,’A’,’b’) from dual;
70. Display the information from emp table.Wherever job ‘manager’ is found it should be diaplayed as boss(replace function).
Select empno,ename replace(job,’MANAGER’,’Boss’) JOB from emp;
71. Display empnoo,ename,deptno from emp table .Instead of display department numbers display the related department name (use decode function).
Select e.empno ,e.ename ,d.dname from emp e ,dept d where e.deptno=d.deptno;
72. Display your age in days.
Select round(sysdate-to_date(’15-aug-1947’))from dual;
73. Display ypur age in months.
Select floor (months_between(sysdate,’15-auf-1947’)) “age in months” from dual;
74. Display current date as 15th august Friday nineteen forty seven.
Select to_char(sysdate,’date month day year’) from dual;
75. Display the following output for each row from emp table as ‘scott has joined the company on Wednesday 13th august nineteen ninety’.
Select ename || ‘has joined the company on ‘ || to_char (hiredate,’day ddth month ear’) from emp;
76. Find the date of nearest Saturday after Current day.
Select next_day (sysdate,’SATURDAY’ ) from dual;
77. Display current time.
Select to_char(Sysydate,’SATURDAY’) from dual;
78. Display the date three months before the current date.
Select add_months(sysdate,-3) from dual;
79. Display the common jobs from department number 10 and 20.
Select job from emp where deptno=10 and job in(select job from emp where deptno=20);
(or)
Select job from emp where deptno=10 intersect select job from emp where deptno=10);
80. Display the jobs found in department number 10 and 20 eliminate duplicate jobs.
Select distinct(job) from emp where deptno=10 and job in(select job from emp where deptno =20
(or)
Select job from emp where deptno=10 intersect select job from emp where deptno=10);
81. Display the jobs which are unique to dept no 10.
Select job from emp where deptno=10 minus select job from emp where deptno!=10;
(or)
Select job from emp where deptno=10 and job not in (select job from emp where deptno<>10);
82. Display the details fo those who do not have any person working under them?
select empno from emp where empno not in (select mgr from emp where mgr is not null);
83. Display the details fo employees who are in sales dept and grad is 3
select * from emp where sal>=(select losal from salgrade where grade=3) and sal <=(select hisal from salgrade where grade=3) and deptno = (Select deptno from dept where dname='SALES');
84. Display those who are not managers and who are managers any one.
select * from emp pwhere empon is ( selelct magr from emp) union select * from emp where empno not in (select mgr from emp where mgr is not null);
85. Display those employees whose name contains not less than 4 chars.
select * from emp where length(ename)>4;
86. Display those departments whose name start with 'S' while location name end with 'O'
Select * from emp where dname like 'S%' and loc like '%O';
876. Display those employees whose manager name is JONES
select * from emp where mgr=(select empno from emp where enames='JONES');
88. Display those employees whose salary is more than 3000 after giving 20% increment.
Select * from emp where sal*120/1000>3000;
(or)
Select * from emp where sal+sal*20/1000>3000;
89.Display all employees with there dept name
select ename, dname from emp e,dept d where e.deptno = d.deptno;
90. Display ename who are working in sales dept.
select empno, ename from emp where deptno=(selec deptno from dept where dname='SALES');
91. Display employee name, deptname, salary and comm. for those sal in between 2000 and 5000 while location is chicago.
select empno, ename, deptno from emp where deptno=(select deptno from dept where loc='CHICAGO:) and sal between 2000 and 5000;
92. Display those employees whose salary greater than his manager salary.
Select * from emp e where sal>(select sal from emp where empno=e.mgr);
93. Display those employee who are working in the same dept where his manager is working
select * from emp e where deptno = ( select deptno from emp where empno = e.mgr);
94. Display those employees who are not working under any manager
select * from emp where mgr is null or empno=mgr;
95. Display grade and employees name for the dept no 10 or 30 but grade is not 4, while joined the company before 31-dec-82
select empno, ename, sal, deptno, hiredate, grade from emp e, salgrade s where e.sal>= s.local and e.sal<=hisal and deptno in (10,30) and grade <>4 and hiredate<'01-dec-1981';
96. Update the salary of each employee by 10% increments that are not eligible for commission.
update emp set sal = sal+(sal*10/100) where comm is null;
97. Delete those employees how joined the company before 31-dec-82 while there dept location is 'NEW YORK' or 'CHICAGO'
delete from emp where hiredate<'31-dec-1982' and deptno in (select deptno from dept where loc in ('NEW YORK','CHICAGO'));
98. Display employee name, job, deptname, location for all who are working as managers.
select ename, job, dname, loc from emp e, dept d where e.deptno=d.deptno and empno in (select mgr from emp);
99. Display those employees whose managers names is Jones, and also display there manager name.
select e.empno, e.ename, m.ename MANAGER from emp e, emp m where e.mgr=m.empno and m.ename='JONES'
100. Display employee name, his job, his dept name, his manager name, his grade and make out of an under department wise.
break on deptno;
select d.deptno, e.ename, e.job, d.dname, m.ename, s.grade from emp e, emp m, dept d, salgrade s where e.deptno= d.deptno and e.sal between s.losal and s.hisal=m.empno order by e.deptno;
101. List out all the employee name, job, and slary grade and department name for every one in the company except 'CLERK'. sort on salary display the highest salary.
select empno, ename, sal, dname, grade from emp e, dept d, salgrade s where e.deptno=.deptno and e.sal between s.losal and s.hisal and e.job<>'CLEAR" order by sal;
102. Display employee name, his job and his manager. Display also employees who are without manager.
select e.ename, e.job, m.ename Manager from emp e, emp m where e.mgr = m.empno union select ename, job, 'no manager' from emp where mgr is null;
103. Find out the top 5 earner of company.
select * from emp e where 5 > (selet count (*) from emp where sal > e.sal) order by sal desc;
104. Display the name of those employees who are getting highest salary.
select empno, ename, sal from emp where sal=(select max(sal) from emp);
105. Display those empoyees whose salary is equal to average of maximum and minimum.
select * from emp where sal=(select(max(sal)+min(sal))/2 from emp);
106. Display count of employees in each department where count greater than 3.
select deptno, count(*) from emp group by deptno having count(*)>3;
107. Display dname where at least 3 are working and display only dname.
select dname from dept where deptno in (select deptno from emp.group by deptno having count(*)>3);
108. Display name of those managers name whose salary is more than average salary of company.
select ename, sal from emp where empno in ( select mgr from emp) and sal >(select avg(sal) from emp);
109 Display those managers name whose salary is more than an average salary of his employees.
select ename, saly from emp e where empno in (select mgr from emp) and e.sal>(select avg(sal) from emp where mgr=e.empno);
110. Display employee name, sal, comm and net pay for those employees whose net pay are greater than or equal to any othere employees salary of the company?
select ename, sal, comm, sal+nv(comm,0) netPay from emp where sal+nv(comm,0)>=any(select sal from emp);
111. Display those employees whose salary is less than his manager but more than salary of any other managers.
select * from emp e where sal<(select sal from emp where empno=emgr) and sal>any(select sal from emp where empno!=e.mgr);
112. Display all employees names with total sal of company with employee name.
113. Find out the last 5 (least) earner of the company?
select * from emp e where 5>(select count(*) from emp where sal<e.sal) order by sal;
114. Find out the numbe of employees whose salary is greater than there manager salary?
select count(*) from emp e whee sal > (select sal from emp whee empno = e.mgr);
115. Display those manager who are not working under president but they are working under any other manager?
select * from emp e where mgr in ( select empno from emp where ename <> 'KING;);
116. Display those employees who joined the company before 15th of the month?
select empno, ename from emp whee hiredate<(to_date('15-'|| to_char(hiredate,'mon) || '-' || to_char(hiredate,'yyyy')));
117. Delete those records where no of employee in a particular department is less than 3?
delete from emp where deptno in ( select deptno emp group by deptno having count(*)>3);
118. List ename,job, annual sal,deptno,dname and grade who earn 30000 per year and who are not clerks
select e.ename,e.job, (e.sal+nvl(e.comm,0))*12, e.deptno,d.dname,s.grade from emp e, salgrade s, dept d where e.sal betweem s.lsal and d.deptno and (e.sal+nvl(cmomm,0))*12> 30000 and e.job<> 'clerk';
119. Display name and salary of ford if his sal is eual to high sal of his grade.
select ename, sal from emp e where ename='FORD' and sal=(select hisal from salgrade where grade=(select grade from sallgrade where e.sal>=losal and e.sal<=hisal));
120.Find out the jon that was failed in the first half of 1983 and the same job that was failed during the same periond in 1984
121. find out the all employees who joined the company before thiere manager
select * from emp e where hiredata<(select hiredate from emp where empno=e.mgr);
122.list out the all employees byu name and number along with their manager's name and number also display 'No Manager'
who has no manager.
select e.empno,e.ename,m.empno manager,m.ename managername from emp e, emp m where e.mgr=m.empno
from emp e, emp m where e,mgr=m.empno
union
select empno,ename,mgr,'No Manager' from emp where mgr is null;
123 Find out the employees who earned the highest Sal in each job typed sort in descending sal order.
select * from emp e where sal=(select max(sal) from emp where job=e.job);
124 Find out the employees who earned the min sal for there job in ascending order
select * from emp e where sal=(select min(sal) from emp where job=e.job) order by sal;
125. find out the most recently hired employees in each dept order by hire date.
select * from emp e where hiredate=(select max(hiredate) from emp where deptno=e.deptno) order by hiredate;
126. Display ename,sal and deptno for each employee who earn a sal greater than the avg of their department order by deptno
select ename,sal,deptno from emp e where sal >(select avg(sal) from emp where deptno=e.deptno) order by deptno;;
127. Display the department where there are no employees;
select deptno,dname from dept where deptno not in(select distinct(deptno) from emp);
128. Display the dept no with highes tannual remuneration bill as compensation.
select deptno,sum(sal) from emp group by deptno having sum(sal) = (select mac(sum(sal)) from emp group by deptno);
129. In which year did most people join the company. Diaplay the year and number of employees(hey try out)
select max(aa) from (select count(*) aa, to _char(hiredate,'yyyy') dd from emp group by to_char(hiredate,'yyyy'))
130. Display avg sal figure for the dept
select deptno,avg(sal) from emp group byu deptno;
131. write a query of display against the row of the most recently hired employee. Display ename hire date and column
max date showing.
select empno, hiredate from emp where hiredate=(select max (hiredate) from emp);
132. Display employees who can earn more than lowest sal in dept no 30
select * from emp where sal>(select min(sal) from deptno=30);
133. Find employees who can earn more than every employees in dept no 30
select * from emp where sal>(select max(sal) from emp where deptno=30);
select * from emp where sal>all(select sal from emp where deptn0=30);
134. select dept name dept no and sum of sal
break on deptno on dname;
select e.deptno,d.dname,sal fdrom emp e, dept d
where e.deptno=d.deptno
order by e.deptno;
135. find out avg sal and ave total remainders for each job type
136. find all dept's which have more than 3 employees.
select deptno from emp group by deptno having count(*)>3;
137. Display the half of the enames in upper case and remaining lowe case.
select concat(upper(substr(ename,0,lengh(ename)/2)), lower (substr(ename,lengh(ename)/2+1,lenght(ename)))) from emp;
138. select ename if ename exists more than once.
select distinct(ename) from emp e where ename in(select ename from emp where e.empno<>empno);
139. Display all enames in reverse order
select ename from emp order by ename desc
140. Display those employee whose joining of month and grade is equal.
select empno,ename from emp e,salgrade s where e.sal between s.losal and s.hisal and to_char(hiredate,'mm')=grade;
141. Display those employee whose joining date is avaiable in dept no
select * from emp where to_char(hiredate,'dd')=deptno;
142. Display those employee name as follows A allen, B black
select substr(ename,1,1)||' ' || ename from emp;
143. List out the employees ename,sal pf from emp
select ename,sal,sal*15/100 pf from emp
144. Display RSPS from emp without using updating,inserting
Create table emp with only one column empno
create table emp(empno number(5));
145. Add this column to emp table ename varchar(20)
alter table emp add ename varchar2(20) not null;
146. opps I forgot to give the primary Key constrains. Add it now.
Alter table emp add constrains emp_empno primary key(empno);
147. now increase the length of ename column to 30 characters,
alter table emp modify ename varchar2(30);
148. Add salary column to emp table.
alter table emp add sal number(7,2);
149. I wan tto give a validation saying that sal cannot be greater 10,000(note give a name to this comumn)
Alter table emp add constraints emp_sal_check check(sal<10000);
150. For the time begin I have decided that i will not impose this validation. My boss has agreed to pay more than 10,0000
Alter table emp disable constrainsts emp_sal_check;
151. My boss has changed his mind. now he doesn't want to pay more than 10,000. so revoke that salary constraints
Alter table emp enable constraints emp_sal_check;
152. Add column called a s mgr to your emp table.
Alter table emp add mgr number(5);
153. Oh ths column should be related to empno. give a command to add this constrains
Alter table emp add constraint emp_mgr foreign key(empno);
154. Add dept no column to your emp table
alter table emp add deptno number(3);
155. This dept no column should be related to deptno column to dept table
alter table emp1 add constraints emp1_deptno foreign key(deptno) referemces dept(deptno);
156. Create table called as new emp. using single command create this table as welll as to get data into this table (use create table as)
create table newemp as select * from emp;
157. create table called as newemp. The table should contains only empno,ename,dname
create table newemp as select empno,ename,dname from emp e, dept d where e,deptno=d.deptno;
158. Delete the rows of employees who are workingin the company for more than 3 years
delete from emp where floor(susdate-hiredaye)>2*365;
159. Provide a commission to employees who are not earning any commission.
update emo set comm=300 where comm is null;
160. If any employees has commsision his commsision should be incremented by 10% of his salary
update emp set comm=comm*10/100 where comm is not null;
161. Display employees name and department name for each employee
select ename,dename from emp e,dept d where e.deptno=d.deptno
162. DIsplay employee number, name and location of the department in which he is working
select empno,ename, loc from emp e, dept d where e.deptno=d.deptno
163. display ename, dname even if the employees in a particular department(use outer join)
select ename,dname from emp e,dept d where e.deptno(+)=d.deptno;
164. Display employee name and his manager name
select e.ename,m.ename from emp e, emp m where e.mgr=m.empno;
165. Display the department name along with total salary in each department.
select deptno,sum(sal) from emp group by deptno;
166.Display the department name and total number of employees in each department
select deptno,count(*) from emp group by deptno;
167. Alter table emp1 add constrains emp1_deptno foreign key(deptno) references dept(deptno)
delete from emp where job name in clerk
