Monday 12 September 2016

SQL QUERIES

1) Display the details of all employees
    SQL>Select * from emp;

2) Display the depart information from department table
    SQL>select * from dept;

3) Display the name and job for all the employees
    SQL>select ename,job from emp;

4) Display the name and salary  for all the employees
    SQL>select ename,sal from emp;

5) Display the employee no and totalsalary  for all the employees
    SQL>select empno,ename,sal,comm, sal+nvl(comm,0) as"total  salary" from
    emp

6) Display the employee name and annual salary for all employees.
    SQL>select ename, 12*(sal+nvl(comm,0)) as "annual Sal" from emp

7) Display the names of all the employees who are working in depart number 10.
    SQL>select emame from emp where deptno=10;

8) Display the names of all the employees who are working as clerks and
   drawing a salary more than 3000.
   SQL>select ename from emp where job='CLERK' and sal>3000;

9) Display the employee number and name  who are earning comm.
   SQL>select empno,ename from emp where comm is not null;

10) Display the employee number and name  who do not earn any comm.
SQL>select empno,ename from emp where comm is null;

11) Display the names of employees who are working as clerks,salesman or
analyst and drawing a salary more than 3000.
SQL>select ename  from emp where job='CLERK' OR JOB='SALESMAN'
          OR JOB='ANALYST' AND SAL>3000;

12) Display the names of the employees who are working in the company for
the past 5 years;
SQL>select ename  from emp where to_char(sysdate,'YYYY')-to_char(hiredate,'YYYY')>=5;

13) Display the list of employees who have joined the company before
30-JUN-90 or after 31-DEC-90.
a)select ename from emp where hiredate < '30-JUN-1990' or hiredate >
'31-DEC-90';

14) Display current Date.
SQL>select sysdate from dual;

18) Display the names of employees working in depart number 10 or 20 or 40
or employees working as
CLERKS,SALESMAN or ANALYST.
SQL>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 alaphabet S.
SQL>select ename from emp where ename like 'S%';

20) Display the Employee names for employees whose name ends with alaphabet S.
SQL>select ename from emp where ename like '%S';

21) Display the names of employees whose names have second alphabet A in
their names.
SQL>select ename from emp where ename like '_A%';

22) select the names of the employee whose names is exactly five characters
in length.
SQL>select ename from emp where length(ename)=5;

23) Display the names of the employee who are not working as MANAGERS.
SQL>select ename from emp where job not in('MANAGER');

24) Display the names of the employee who are not working as SALESMAN OR
CLERK OR ANALYST.
SQL>select ename from emp where job not
in('SALESMAN','CLERK','ANALYST');

26) Display the total number of employee working in the company.
SQL>select count(*) from emp;

27) Display the total salary beiging paid to all employees.
SQL>select sum(sal) from emp;

28) Display the maximum salary from emp table.
SQL>select max(sal) from emp;

29) Display the minimum salary from emp table.
SQL>select min(sal) from emp;

30) Display the average salary from emp table.
SQL>select avg(sal) from emp;

31) Display the maximum salary being paid to CLERK.
SQL>select max(sal) from emp where job='CLERK';

32) Display the maximum salary being paid to depart number 20.
SQL>select max(sal) from emp where deptno=20;

33) Display the minimum salary being paid to any SALESMAN.
SQL>select min(sal) from emp where job='SALESMAN';

34) Display the average salary drawn by MANAGERS.
SQL>select avg(sal) from emp where job='MANAGER';

35) Display the total salary drawn by ANALYST working in depart number 40.
SQL>select sum(sal) from emp where job='ANALYST' and deptno=40;

36) Display the names of the employee in order of salary i.e the name of
the employee earning lowest salary    should salary appear first.
SQL>select ename from emp order by sal;

37) Display the names of the employee in descending order of salary.
a)select ename from emp order by sal desc;

38) Display the names of the employee in order of employee name.
a)select ename from emp order by ename;

39) Display empno,ename,deptno,sal sort the output first base on name and
within name by deptno and with in deptno by sal.
SQL>select empno,ename,deptno,sal from emp order by

40) Display the name of the employee along with their annual salary(sal*12).The name of the employee earning highest annual salary should apper first.
SQL>select ename,sal*12 from emp order by sal desc;

41) Display name,salary,hra,pf,da,total salary for each employee. The
output should be in the order of total salary,hra 15% of salary,da 10% of salary,pf 5%
salary,total salary will be(salary+hra+da)-pf.
SQL>select ename,sal,sal/100*15 as hra,sal/100*5 as pf,sal/100*10 as
da, sal+sal/100*15+sal/100*10-sal/100*5 as total from emp;

42) Display depart numbers and total number of employees working in each
department.
SQL>select deptno,count(deptno)from emp group by deptno;

43) Display the various jobs and total number of employees within each job
group.
SQL>select job,count(job)from emp group by job;

44) Display the depart numbers and total salary for each department.
SQL>select deptno,sum(sal) from emp group by deptno;


45) Display the depart numbers and max salary for each department.
SQL>select deptno,max(sal) from emp group by deptno;

46) Display the various jobs and total salary for each job
SQL>select job,sum(sal) from emp group by job;

47) Display the various jobs and total salary for each job
SQL>select job,min(sal) from emp group by job;

48) Display the depart numbers with more than three employees in each dept.
SQL>select deptno,count(deptno) from emp group by deptno having
count(*)>3;

49) Display the various jobs along with total salary for each of the jobs
where total salary is greater than 40000.
SQL>select job,sum(sal) from emp group by job having sum(sal)>40000;

50) Display the various jobs along with total number of employees in each
job.The output should contain only those  jobs with more than three employees.
SQL>select job,count(empno) from emp group by job having count(job)>3

51) Display the name of the empployee who earns highest salary.
SQL>select ename from emp where sal=(select max(sal) from emp);

52) Display the employee number and name for employee working as clerk and
earning highest salary among clerks.
SQL>select empno,ename from emp where where job='CLERK'
           and sal=(select max(sal) from emp  where job='CLERK');

53) Display the names of salesman who earns a salary more than the highest
salary of any clerk.
SQL>select ename,sal from emp where job='SALESMAN' and sal>(select
max(sal) from emp
 where job='CLERK');

54) Display the names of clerks who earn a salary more than the lowest
salary of any salesman.
SQL>select ename from emp where job='CLERK' and sal>(select min(sal)
from emp
             where job='SALESMAN');

Display the names of employees who earn a salary more than that of
Jones or that of salary grether than   that of scott.
SQL>select ename,sal from emp where sal>
(select sal from emp where ename='JONES')and sal> (select sal from emp
where ename='SCOTT');

55) Display the names of the employees who earn highest salary in their
respective departments.
SQL>select ename,sal,deptno from emp where sal in(select max(sal) from
emp group by deptno);

56) Display the names of the employees who earn highest salaries in their
respective job groups.
SQL>select ename,sal,job from emp where sal in(select max(sal) from emp
group by job)

57) Display the employee names who are working in accounting department.
SQL>select ename from emp where deptno=(select deptno from dept where
dname='ACCOUNTING')

58) Display the employee names who are working in Chicago.
SQL>select ename from emp where deptno=(select deptno from dept where
LOC='CHICAGO')

59) Display the Job groups having total salary greater than the maximum
salary for managers.
SQL>SELECT JOB,SUM(SAL) FROM EMP GROUP BY JOB HAVING SUM(SAL)>(SELECT
MAX(SAL) FROM EMP WHERE JOB='MANAGER');

62) Display the names of the employees in Uppercase.
SQL>select upper(ename)from emp

63) Display the names of the employees in Lowecase.
SQL>select lower(ename)from emp

64) Display the names of the employees in Propercase.
SQL>select initcap(ename)from emp;

65) Display the length of Your name using appropriate function.
SQL>select length('name') from dual

66) Display the length of all the employee names.
SQL>select length(ename) from emp;

67) select name of the employee concatenate with employee number.
SQL>select ename||empno from emp;

68) User appropriate function and extract 3 characters starting from 2
characters from the following  string 'Oracle'. i.e the out put should be 'ac'.
SQL>select substr('oracle',3,2) from dual

69) Find the First occurance of character 'a' from the following string i.e
'Computer Maintenance Corporation'.
SQL>SELECT INSTR('Computer Maintenance Corporation','a',1) FROM DUAL

70) Replace every occurance of alphabhet A with B in the string Allens(use
translate function)
SQL>select translate('Allens','A','B') from dual

71) Display the informaction from emp table.Where job manager is found it
should be displayed as boos(Use replace function).
SQL>select replace(JOB,'MANAGER','BOSS') FROM EMP;

72) Display empno,ename,deptno from emp table.Instead of display department
numbers display the related department name(Use decode function).
SQL>select empno,ename,decode(deptno,10,'ACCOUNTING',20,'RESEARCH',30,'SALES',40,'OPRATIONS') from emp;

73) Display your age in days.
SQL>select to_date(sysdate)-to_date('10-sep-77')from dual

74) Display your age in months.
SQL>select months_between(sysdate,'10-sep-77') from dual

75) Display the current date as 15th Augest Friday Nineteen Ninety Saven.
SQL>select to_char(sysdate,'ddth Month day year') from dual

76) Display the following output for each row from emp table.

scott has joined the company on wednesday 13th August ninten nintey.
SQL>select ENAME||' HAS JOINED THE COMPANY ON  '||to_char(HIREDATE,'day
ddth Month  year')   from EMP;

77) Find the date for nearest saturday after current date.
SQL>SELECT NEXT_DAY(SYSDATE,'SATURDAY')FROM DUAL;

78) Display current time.
SQL>select to_char(sysdate,'hh:MM:ss') from dual.

79) Display the date three months Before the current date.
SQL>select add_months(sysdate,3) from dual;

80) Display the common jobs from department number 10 and 20.
SQL>select job from emp where deptno=10 and job in(select job from emp
where deptno=20);

81) Display the jobs found in department 10 and 20 Eliminate duplicate jobs.
SQL>select distinct(job) from emp where deptno=10 or deptno=20
           (or)
SQL>select distinct(job) from emp where deptno in(10,20);

82) Display the jobs which are unique to department 10.
SQL>select distinct(job) from emp where deptno=10

83) Display the details of those who do not have any person working under them.
SQL>select e.ename from emp,emp e where emp.mgr=e.empno group by
e.ename having count(*)=1;

84) Display the details of those employees who are in sales department and
grade is 3.

SQL>select * from emp where deptno=(select deptno from dept where
dname='SALES')and sal between(select losal from salgrade where grade=3)and
             (select hisal from salgrade where grade=3);

85) Display those who are not managers and who are managers any one.
i)display the managers names
SQL>select distinct(m.ename) from emp e,emp m where m.empno=e.mgr;

ii)display the who are not managers
SQL>select ename from emp where ename not in(select distinct(m.ename)
         from emp e,emp m where m.empno=e.mgr);

86) Display those employee whose name contains not less than 4 characters.
SQL>select ename from emp where length(ename)>4;

87) Display those department whose name start with "S" while the location
name ends with "K".
SQL>select dname from dept where dname like 'S%' and loc like '%K';

88) Display those employees whose manager name is JONES.
SQL>select p.ename from emp e,emp p where e.empno=p.mgr and
e.ename='JONES';

89) Display those employees whose salary is more than 3000 after giving 20%
increment.
SQL>select ename,sal from emp where (sal+sal*.2)>3000;

90) Display all employees while their dept names;
SQL>select ename,dname from emp,dept where emp.deptno=dept.deptno

91) Display ename who are working in sales dept.
SQL>select ename from emp where deptno=(select deptno from dept where
dname='SALES');

92) Display employee name,deptname,salary and comm for those sal in between
2000 to 5000 while location is chicago.
SQL>select ename,dname,sal,comm from emp,dept where sal  between 2000
and 5000
          and loc='CHICAGO' and emp.deptno=dept.deptno;

93)Display those employees whose salary greter than his manager salary.
SQL>select p.ename from emp e,emp p where e.empno=p.mgr and p.sal>e.sal

94) Display those employees who are working in the same dept where his
manager is work.
SQL>select p.ename from emp e,emp p where e.empno=p.mgr and
p.deptno=e.deptno;

95) Display those employees who are not working under any manager.
SQL>select ename from emp where mgr is null

96) 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.
SQL>select ename,grade from emp,salgrade where sal between losal and
hisal and deptno     in(10,30) and grade<>4 and hiredate<'31-DEC-82';


97) Update the salary of each employee by 10% increment who are not
eligiblw for commission.
SQL>update emp set sal=sal+sal*10/100 where comm is null;

98) SELECT those employee who joined the company before 31-dec-82 while
their dept location is newyork or  Chicago.
SQL>SELECT EMPNO,ENAME,HIREDATE,DNAME,LOC FROM EMP,DEPT
 WHERE (EMP.DEPTNO=DEPT.DEPTNO)AND
HIREDATE <'31-DEC-82' AND DEPT.LOC IN('CHICAGO','NEW YORK');

99) DISPLAY EMPLOYEE NAME,JOB,DEPARTMENT,LOCATION FOR ALL WHO ARE WORKING
AS  MANAGER?
SQL>select ename,JOB,DNAME,LOCATION from emp,DEPT where mgr is not
null;

100) DISPLAY THOSE EMPLOYEES WHOSE MANAGER NAME IS JONES? --
          [AND ALSO DISPLAY THEIR MANAGER NAME]?
SQL> SELECT P.ENAME FROM EMP E, EMP P WHERE E.EMPNO=P.MGR AND
E.ENAME='JONES';

101) Display name and salary of ford if his salary is equal to hisal of his
grade
a)select ename,sal,grade from emp,salgrade where sal between losal and
hisal
 and ename ='FORD' AND HISAL=SAL;

102) Display employee name,job,depart name ,manager name,his grade and make
out an under department wise?
SQL>SELECT E.ENAME,E.JOB,DNAME,EMP.ENAME,GRADE FROM EMP,EMP
E,SALGRADE,DEPT
WHERE EMP.SAL BETWEEN LOSAL AND HISAL AND EMP.EMPNO=E.MGR
 AND EMP.DEPTNO=DEPT.DEPTNO ORDER BY DNAME

103) List out all employees name,job,salary,grade and depart name for every
one in the company  except 'CLERK'.Sort on salary display the highest salary?
SQL>SELECT ENAME,JOB,DNAME,SAL,GRADE FROM EMP,SALGRADE,DEPT WHERE
SAL BETWEEN LOSAL AND HISAL AND EMP.DEPTNO=DEPT.DEPTNO AND JOB
 NOT IN('CLERK')ORDER BY SAL ASC;

105) Find out the top 5 earners of company?
SQL>SELECT DISTINCT SAL FROM EMP E WHERE 5>=(SELECT COUNT(DISTINCT SAL)
FROM
           EMP A WHERE A.SAL>=E.SAL)ORDER BY SAL DESC;


106) Display name of those employee who are getting the highest salary?
SQL>select ename from emp where sal=(select max(sal) from emp);

107) Display those employee whose salary is equal to average of maximum and
minimum?
SQL>select ename from emp where sal=(select max(sal)+min(sal)/2 from
emp);

108) Select count of employee in each department  where count greater than 3?
SQL>select count(*) from emp group by deptno having count(deptno)>3

109) Display dname where at least 3 are working and display only department
name?
SQL>select distinct d.dname from dept d,emp e where d.deptno=e.deptno
and 3>any
           (select count(deptno) from emp group by deptno)

110) Display name of those managers name whose salary is more than average
salary of his company?
SQL>SELECT E.ENAME,EMP.ENAME FROM EMP,EMP E
           WHERE EMP.EMPNO=E.MGR AND E.SAL>(SELECT AVG(SAL) FROM EMP);

111)Display those managers name whose salary is more than average salary of
his employee?
SQL>SELECT DISTINCT EMP.ENAME FROM EMP,EMP E WHERE
            E.SAL <(SELECT AVG(EMP.SAL) FROM EMP
            WHERE EMP.EMPNO=E.MGR GROUP BY EMP.ENAME) AND
EMP.EMPNO=E.MGR;

112) Display employee name,sal,comm and net pay for those employee
whose net pay is greter than or equal to any other employee salary of
the company?
SQL>select ename,sal,comm,sal+nvl(comm,0) as NetPay from emp
          where sal+nvl(comm,0) >any (select sal from emp)


113) Display all employees names with total sal of company with each
employee name?
SQL>SELECT ENAME,(SELECT SUM(SAL)  FROM EMP) FROM EMP;

114) Find out last 5(least)earners of the company.?
SQL>SELECT DISTINCT SAL FROM EMP E WHERE
           5>=(SELECT COUNT(DISTINCT SAL) FROM EMP A WHERE
A.SAL<=E.SAL)
           ORDER BY SAL DESC;

115) Find out the number of employees whose salary is greater than their
manager salary?
SQL>SELECT E.ENAME FROM EMP ,EMP E WHERE EMP.EMPNO=E.MGR
        AND EMP.SAL<E.SAL;

116) Display those department where no employee working?
SQL>select dname from emp,dept where emp.deptno not in(emp.deptno)

117) Display those employee whose salary is ODD value?
SQL>select * from emp where sal<0;

118) Display those employee whose salary contains alleast 3 digits?
SQL>select * from emp where length(sal)>=3;

119) Display those employee who joined in the company in the month of Dec?
SQL>select ename from emp where to_char(hiredate,'MON')='DEC';

120) Display those employees whose name contains "A"?
SQL>select ename from emp where instr(ename,'A')>0;
                          or
SQL>select ename from emp where ename like('%A%');

121) Display those employee whose deptno is available in salary?
SQL>select emp.ename from emp, emp e where emp.sal=e.deptno;

122) Display those employee whose first 2 characters from hiredate -last 2
characters of salary?
SQL>select ename,SUBSTR(hiredate,1,2)||ENAME||substr(sal,-2,2) from emp

123) Display those employee whose 10% of salary is equal to the year of
joining?
SQL>select ename from emp where to_char(hiredate,'YY')=sal*0.1;

124) Display those employee who are working in sales or research?
SQL>SELECT ENAME FROM EMP WHERE DEPTNO IN(SELECT DEPTNO FROM DEPT WHERE
           DNAME IN('SALES','RESEARCH'));

125) Display the grade of jones?
SQL>SELECT ENAME,GRADE FROM EMP,SALGRADE
            WHERE SAL BETWEEN LOSAL AND HISAL AND Ename='JONES';

126) Display those employees who joined the company before 15 of the month?
a)select ename from emp where to_char(hiredate,'DD')<15;

127) Display those employee who has joined before 15th of the month.
a)select ename from emp where to_char(hiredate,'DD')<15;

128) Delete those records where no of employees in a particular department
is less than 3.
SQL>delete from emp where deptno=(select deptno from emp
           group by deptno having count(deptno)<3);


129) Display the name of the department where no employee working.
SQL> SELECT E.ENAME,E.JOB,M.ENAME,M.JOB FROM EMP E,EMP M
 WHERE E.MGR=M.EMPNO

130) Display those employees who are working as manager.
SQL>SELECT M.ENAME MANAGER FROM EMP M ,EMP E
WHERE E.MGR=M.EMPNO GROUP BY M.ENAME

131) Display those employees whose grade is equal to any number of sal but
not equal to first number of sal?
SQL> SELECT ENAME,GRADE FROM EMP,SALGRADE
            WHERE GRADE NOT IN(SELECT SUBSTR(SAL,0,1)FROM EMP)

132) Print the details of all the employees who are Sub-ordinate to BLAKE?
SQL>select emp.ename from emp, emp e where emp.mgr=e.empno and
e.ename='BLAKE';


133) Display employee name and his salary whose salary is greater than
  highest average of department number?
SQL>SELECT SAL FROM EMP WHERE SAL>(SELECT MAX(AVG(SAL)) FROM EMP
         GROUP BY DEPTNO);

134) Display the 10th record of emp table(without using rowid)
SQL>SELECT * FROM EMP WHERE ROWNUM<11
             MINUS
             SELECT * FROM EMP WHERE ROWNUM<10

135) Display the half of the ename's in upper case and remaining lowercase?
SQL>SELECT
SUBSTR(LOWER(ENAME),1,3)||SUBSTR(UPPER(ENAME),3,LENGTH(ENAME))
           FROM EMP;

136) Display the 10th record of emp table without using group by and rowid?
SQL>SELECT * FROM EMP WHERE ROWNUM<11
             MINUS
             SELECT * FROM EMP WHERE ROWNUM<10

             Delete the 10th record of emp table.
SQL>DELETE FROM EMP WHERE EMPNO=(SELECT EMPNO FROM EMP WHERE ROWNUM<11
             MINUS
             SELECT EMPNO FROM EMP WHERE ROWNUM<10)

137) Create a copy of emp table;
SQL>create table new_table as select * from emp where 1=2;
  
138) Select ename if ename exists more than once.
SQL>select ename  from emp e group by ename having count(*)>1;

139) Display all enames in reverse order?(SMITH:HTIMS).
SQL>SELECT REVERSE(ENAME)FROM EMP;

140) Display those employee whose joining of month and grade is equal.
SQL>SELECT ENAME FROM EMP WHERE SAL BETWEEN
           (SELECT LOSAL FROM SALGRADE WHERE
             GRADE=TO_CHAR(HIREDATE,'MM')) AND
        (SELECT HISAL FROM SALGRADE WHERE
GRADE=TO_CHAR(HIREDATE,'MM'));
            
141) Display those employee whose joining DATE is available in deptno.
SQL>SELECT ENAME FROM EMP WHERE TO_CHAR(HIREDATE,'DD')=DEPTNO

142) Display those employees name as follows
               A ALLEN
               B BLAKE
SQL> SELECT SUBSTR(ENAME,1,1),ENAME FROM EMP;

143) List out the employees ename,sal,PF(20% OF SAL) from emp;
SQL>SELECT ENAME,SAL,SAL*.2 AS PF FROM EMP;       


144) Create table emp with only one column empno;
SQL>Create table emp as select empno from emp where 1=2;

145) Add this column to emp table ename vrachar2(20).
SQL>alter table emp add(ename varchar2(20));

146) Oops I forgot give the primary key constraint.  Add in now.
SQL>alter table emp add primary key(empno);

147) Now increase the length of ename column to 30 characters.
SQL>alter table emp modify(ename varchar2(30));

148) Add salary column to emp table.
SQL>alter table emp add(sal number(10));

149) I want to give a validation saying that salary cannot be greater 10,000
(note give a name to this constraint)
SQL>alter table emp add constraint chk_001 check(sal<=10000)

150) For the time being I have decided that I will not impose this validation.My boss has agreed to pay more than 10,000.
SQL>again alter the table or drop constraint with  alter table emp drop constraint chk_001 (or)Disable the constraint by using  alter table emp modify constraint chk_001 disable;

151) My boss has changed his mind.  Now he doesn't want to pay more than
10,000.so revoke that salary constraint.
SQL>alter table emp modify constraint chk_001 enable;

152) Add column called as mgr to your emp table;
SQL>alter table emp add(mgr number(5));

153) Oh! This column should be related to empno.  Give a command to add this
constraint.
SQL>ALTER TABLE EMP ADD CONSTRAINT MGR_DEPT FOREIGN KEY(MGR) REFERENCES
EMP(EMPNO)
                                     
154) Add deptno column to your emp table;
SQL>alter table emp add(deptno number(5));  

155) This deptno column should be related to deptno column of dept table;
SQL>alter table emp add constraint dept_001 foreign key(deptno)
reference dept(deptno) 
             [deptno should be primary key]

156) Give the command to add the constraint.
SQL>alter table <table_name) add constraint <constraint_name>
<constraint type>

157) Create table called as newemp.  Using single command create this table
as well as get data into this table(use create table as);
SQL>create table newemp as select * from emp;

SQL>Create table called as newemp.  This table should contain only
empno,ename,dname.
SQL>create table newemp as select empno,ename,dname from emp,dept where
1=2;

158) Delete the rows of employees who are working in the company for more
than 2 years.
SQL>delete from emp where (sysdate-hiredate)/365>2;

159) Provide a commission(10% Comm Of Sal) to employees who are not earning
any commission.
SQL>select sal*0.1 from emp where comm is null

160) If any employee has commission his commission should be incremented by
10% of his salary.
SQL>update emp set comm=sal*.1 where comm is not null;

161) Display employee name and department name for each employee.
SQL>select empno,dname from emp,dept where emp.deptno=dept.deptno

162)Display employee number,name and location of the department in which he
is working.
SQL>select empno,ename,loc,dname from emp,dept where
emp.deptno=dept.deptno;

163) Display ename,dname even if there are no employees working in a
particular department(use outer join).
SQL>select ename,dname from emp,dept where emp.deptno=dept.deptno(+)

164) Display employee name and his manager name.
SQL>select p.ename,e.ename from emp e,emp p where e.empno=p.mgr;

165) Display the department name and total number of employees in each
department.
SQL>select dname,count(ename) from emp,dept where
emp.deptno=dept.deptno group by dname;

166)Display the department name along with total salary in each department.
SQL>select dname,sum(sal) from emp,dept where emp.deptno=dept.deptno
group by dname;

167) Display itemname and total sales amount for each item.
SQL>select itemname,sum(amount) from item group by itemname;

168) Write a Query To Delete The Repeted Rows from emp table;
SQL>Delete from emp where rowid not in(select min(rowid)from emp group
by ename)
            
169) TO DISPLAY 5 TO 7 ROWS FROM A TABLE
SQL>select ename from emp
         where rowid in(select rowid from emp where rownum<=7
         minus
  select rowid from empi where rownum<5)

170)  DISPLAY  TOP N ROWS FROM TABLE?

SQL>SELECT * FROM
             (SELECT *  FROM EMP ORDER BY ENAME DESC)
              WHERE ROWNUM <10;

171) DISPLAY   TOP 3 SALARIES FROM EMP;
SQL>SELECT SAL FROM ( SELECT  * FROM EMP ORDER  BY SAL DESC )
                   WHERE ROWNUM <4

172) DISPLAY  9th RECORD FROM THE EMP TABLE?
SQL>SELECT ENAME FROM EMP
             WHERE ROWID=(SELECT ROWID FROM EMP WHERE ROWNUM<=10
             MINUS
             SELECT ROWID FROM EMP WHERE ROWNUM <10)
173)       SELECT SEOND MAX SALARY FROM EMP;
SQL>     select max(sal) fromemp where sal<(select  max(sal) from emp);

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