Important dbms practical question
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1. Create Tables and Insert data (First data using Insert query rest can be feeded.) 2. Write an SQL query to print details of the Workers whose FIRST_NAME ends with ‘h’ and contains six alphabets. 3. Change Last_Name Columns name to Surname. 4. Write an SQL query to print details of the Workers whose SALARY lies between 100000 and 500000. 5. Write an SQL query to fetch the count of employees working in the department ‘Admin’. 6. Write an SQL query to fetch the no. of workers for each department in the descending order. 7. Write an SQL query to print details of the Workers who are also Managers. 8. Select Top 10 salaries and Employees Full name from Worker table. 9. Write an SQL query to fetch the list of employees with the same salary.
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Important dbms practical question
- 1. Sample Table – Worker WORKER_IDFIRST_NAMELAST_NAME SALARY JOINING_DATE DEPARTMENT 001 Monika Arora 100000 2014-02-20 09:00:00 HR 002 Niharika Verma 80000 2014-06-11 09:00:00 Admin 003 Vishal Singhal 300000 2014-02-20 09:00:00 HR 004 Amitabh Singh 500000 2014-02-20 09:00:00 Admin 005 Vivek Bhati 500000 2014-06-11 09:00:00 Admin 006 Vipul Diwan 200000 2014-06-11 09:00:00 Account 007 Satish Kumar 75000 2014-01-20 09:00:00 Account 008 Geetika Chauhan 90000 2014-04-11 09:00:00 Admin Sample Table – Bonus WORKER_REF_ID BONUS_DATE BONUS_AMOUNT 1 2016-02-20 00:00:00 5000 2 2016-06-11 00:00:00 3000 3 2016-02-20 00:00:00 4000 1 2016-02-20 00:00:00 4500 2 2016-06-11 00:00:00 3500 Sample Table – Title WORKER_REF_ID WORKER_TITLE AFFECTED_FROM 1 Manager 2016-02-20 00:00:00 2 Executive 2016-06-11 00:00:00 8 Executive 2016-06-11 00:00:00 5 Manager 2016-06-11 00:00:00 4 Asst. Manager 2016-06-11 00:00:00 7 Executive 2016-06-11 00:00:00 6 Lead 2016-06-11 00:00:00 3 Lead 2016-06-11 00:00:00
- 2. Perform Following Task 1. Create Tables and Insert data (First data using Insert query rest can be feeded.) 2. Write an SQL query to print details of the Workers whose FIRST_NAME ends with ‘h’ and contains six alphabets. 3. Change Last_Name Columns name to Surname. 4. Write an SQL query to print details of the Workers whose SALARY lies between 100000 and 500000. 5. Write an SQL query to fetch the count of employees working in the department ‘Admin’. 6. Write an SQL query to fetch the no. of workers for each department in the descending order. 7. Write an SQL query to print details of the Workers who are also Managers. 8. Select Top 10 salaries and Employees Full name from Worker table. 9. Write an SQL query to fetch the list of employees with the same salary. Question-1. Create Tables and Insert data (First data using Insert query rest can be feeded.) Answer 1. CREATE TABLE WORKER( WORKER_ID NUMBER(4), FIRST_NAME VARCHAR2(10), LAST_NAME VARCHAR2(10), SALARY NUMBER(10), JOINING_DATE TIMESTAMP , DEPARTMENT VARCHAR2(10)); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Monika','Arora',100000,TIMESTAMP '2014-02-20 09:00:00','HR'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Niharika','Verma',80000,TIMESTAMP '2014-06-11 09:00:00','Admin'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Vishal','Singhal',300000,TIMESTAMP '2014-02-20 09:00:00','HR'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Amitabh','Singh',500000,TIMESTAMP '2014-02-20 09:00:00','Admin'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department)
- 3. values(worker_seq.nextval,'Vivek','Bhati',500000,TIMESTAMP '2014-06-11 09:00:00','Admin'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Vipul','Diwan',200000,TIMESTAMP '2014-06-11 09:00:00','Acount'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Satish','Kumar',75000,TIMESTAMP '2014-01-20 09:00:00','Acount'); insert into worker(Worker_id,first_name,last_name,salary,joining_date,department) values(worker_seq.nextval,'Geetika','Chauhan',90000,TIMESTAMP '2014-04-11 09:00:00','Admin'); Question-2:- Write an SQL query to print details of the Workers whose FIRST_NAME ends with ‘h’ and contains six alphabets. Answer-2:- Select * from Worker where FIRST_NAME like '_____h';
- 4. Question-3:- Change Last_Name Columns name to Surname. Answer-3:- ALTER TABLE Worker RENAME COLUMN Last_name TO Surname;
- 5. Question-4:-. Write an SQL query to print details of the Workers whose SALARY lies between 100000 and 500000. Answer-4:- select * from worker where salary between 100000 and 500000; Queston-5:- Write an SQL query to fetch the count of employees working in the department ‘Admin’. Answer-5:- select count (*) from worker where department ='Admin';
- 6. Question-6:- Write an SQL query to fetch the no. of workers for each department in the descending order Answer-6:- SELECT DEPARTMENT, count(WORKER_ID) No_Of_Workers FROM worker GROUP BY DEPARTMENT ORDER BY No_Of_Workers DESC;
- 7. Question-7:- Write an SQL query to print details of the Workers who are also Managers. Answer-7:- SELECT DISTINCT W.FIRST_NAME, T.WORKER_TITLE FROM Worker W INNER JOIN Title T ON W.WORKER_ID = T.WORKER_REF_ID AND T.WORKER_TITLE in ('Manager'); Question-8:- Select Top 10 salaries and Employees Full name from Worker table. Answer-8:- SELECT * FROM (SELECT * FROM Worker ORDER BY Salary DESC) WHERE ROW NUM <= 10;
- 8. Question-9:- Write an SQL query to fetch the list of employees with the same salary. Answer-9:- Select distinct W.WORKER_ID, W.FIRST_NAME, W.Salary from Worker W, Worker W1 where W.Salary = W1.Salary and W.WORKER_ID != W1.WORKER_ID;