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
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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
137)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)
138) Create a copy of emp table;
SQL>create table new_table as select * from emp where 1=2;
139) Select ename if ename exists more than once.
SQL>select ename from emp e group by ename having count(*)>1;
140) Display all enames in reverse order?(SMITH:HTIMS).
SQL>SELECT REVERSE(ENAME)FROM EMP;
141) 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')
);
142) Display those employee whose joining DATE is available in deptno.
SQL>SELECT ENAME FROM EMP WHERE TO_CHAR(HIREDATE,'DD')=DEPTNO
143) Display those employees name as follows
A ALLEN
B BLAKE
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SQL> SELECT SUBSTR(ENAME,1,1),ENAME FROM EMP;
144) List out the employees ename,sal,PF(20% OF SAL) from emp;
SQL>SELECT ENAME,SAL,SAL*.2 AS PF FROM EMP;
145) Create table emp with only one column empno;
SQL>Create table emp as select empno from emp where 1=2;
146) Add this column to emp table ename varchar2(20).
SQL>alter table emp add(ename varchar2(20));
147) Oops I forgot give the primary key constraint. Add in now.
SQL>alter table emp add primary key(empno);
148) Now increase the length of ename column to 30 characters.
SQL>alter table emp modify(ename varchar2(30));
149) Add salary column to emp table.
SQL>alter table emp add(sal number(10));
150) 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)
151) 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;
152) 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;
153) Add column called as mgr to your emp table;
SQL>alter table emp add(mgr number(5));
154) 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)
155) Add deptno column to your emp table;
SQL>alter table emp add(deptno number(5));
156) 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]
157) Give the command to add the constraint.
SQL>alter table <table_name) add constraint <constraint_name>
<constraint type>
158) 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;
159) 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;
160) 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
161) 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;
162) Display employee name and department name for each employee.
SQL>select empno,dname from emp,dept where emp.deptno=dept.deptno
163)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;
164) 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(+)
165) Display employee name and his manager name.
SQL>select p.ename,e.ename from emp e,emp p where e.empno=p.mgr;
166) 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;
167)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;
168) Display itemname and total sales amount for each item.
SQL>select itemname,sum(amount) from item group by itemname;
169) 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)
170) 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)
171) DISPLAY TOP N ROWS FROM TABLE?
SQL>SELECT * FROM
(SELECT * FROM EMP ORDER BY ENAME DESC)
WHERE ROWNUM <10;
172) DISPLAY TOP 3 SALARIES FROM EMP;
SQL>SELECT SAL FROM ( SELECT * FROM EMP ORDER BY SAL DESC )
WHERE ROWNUM <4
173) DISPLAY 9th 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)
174) select second max salary from emp;
SQL>select max(sal) from emp where sal<(select max(sal) from emp);
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