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Oracle examples
1.
8-1
Copyright © 2004, Oracle. All rights reserved.
2.
Using the NVL
Function ex1:- To calculate the annual compensation of all employees, you need to multiply the monthly salary by 12 and then add the commission percentage to the result SELECT last_name, salary, NVL(commission_pct, 0), (salary*12) + (salary*12*NVL(commission_pct, 0)) AN_SAL FROM employees; . . 8-2 Copyright © 2004, Oracle. All rights reserved.
3.
Using the NVL2
Function SELECT last_name, salary, commission_pct, NVL2(commission_pct,'SAL+COMM', 'SAL') income FROM employees WHERE department_id IN (50, 80); . . 8-3 Copyright © 2004, Oracle. All rights reserved.
4.
Executing Single-Row Subqueries
ex1:- displays employees whose job ID is the same as that of employee 141 and whose salary is greater than that of employee 143. SELECT last_name, job_id, salary FROM employees WHERE job_id = ST_CLERK (SELECT job_id FROM employees WHERE employee_id = 141) AND salary > 2600 (SELECT salary FROM employees WHERE employee_id = 143); The result in next slide 8-4 Copyright © 2004, Oracle. All rights reserved.
5.
8-5
Copyright © 2004, Oracle. All rights reserved.
6.
Executing Single-Row Subqueries
ex2:- Find the job with the lowest average salary. SELECT job_id, AVG(salary) FROM employees GROUP BY job_id HAVING AVG(salary)=(SELECT MIN(AVG(salary)) FROM employees GROUP BY job_id); 8-6 Copyright © 2004, Oracle. All rights reserved.
7.
Will This Statement
Return Rows? SELECT last_name, job_id FROM employees WHERE job_id = (SELECT job_id FROM employees WHERE last_name = 'Haas'); there is no employee named Haas. So the subquery returns no rows The outer query takes the results of the subquery (null) and uses these results in its WHERE clause. The outer query finds no employee with a job ID equal to null, and so returns no rows 8-7 Copyright © 2004, Oracle. All rights reserved.
8.
Executing multiple-Row Subqueries
ex3:- display the employees whose there salary equal to the min salary of each department. SELECT last_name, salary, department_id FROM employees WHERE salary IN (SELECT MIN(salary) FROM employees GROUP BY department_id); The result in next slide 8-8 Copyright © 2004, Oracle. All rights reserved.
9.
8-9
Copyright © 2004, Oracle. All rights reserved.
10.
Executing multiple-Row Subqueries
ex4:- displays employees who are not IT programmers and whose salary is less than that of any IT programmer. SELECT employee_id, last_name, job_id, salary FROM employees 9000, 6000, 4800,4200 WHERE salary < ANY (SELECT distinct salary FROM employees WHERE job_id = 'IT_PROG') AND job_id <> 'IT_PROG'; =ANY is equivalent to IN. >ANY means more than the minimum. <ANY means less than the maximum The result in next slide 8-10 Copyright © 2004, Oracle. All rights reserved.
11.
.
. 8-11 Copyright © 2004, Oracle. All rights reserved.
12.
Executing multiple-Row Subqueries
ex4:- displays employees who are not IT programmers and whose salary is less than that of all IT programmer. SELECT employee_id, last_name, job_id, salary FROM employees 9000, 6000, 4800,4200 WHERE salary < ALL (SELECT distinct salary FROM employees WHERE job_id = 'IT_PROG') AND job_id <> 'IT_PROG'; >ALL means more than the maximum <ALL means less than the minimum The result in next slide 8-12 Copyright © 2004, Oracle. All rights reserved.
13.
.
. . . 8-13 Copyright © 2004, Oracle. All rights reserved.
14.
Create a query
that displays the first eight characters of the employees’ last names and indicates the amounts of their salaries with stars. Each star signifies a thousand dollars. Sort the data in descending order of salary. Label the column EMPLOYEES_AND_THEIR_SALARIES. 8-14 Copyright © 2004, Oracle. All rights reserved.
15.
8-15
Copyright © 2004, Oracle. All rights reserved.
16.
8-16
Copyright © 2004, Oracle. All rights reserved.
17.
8-17
Copyright © 2004, Oracle. All rights reserved.
18.
The function check_sal
is written to check if the salary of a particular employee is greater or less than the average salary of all employees working in his department. The function returns TRUE if the salary of the employee is greater than the average salary of employees in his department else returns FALSE. The function returns NULL if a NO_DATA_FOUND exception is thrown. 8-18 Copyright © 2004, Oracle. All rights reserved.
19.
8-19
Copyright © 2004, Oracle. All rights reserved.
20.
Observe that the
function checks for the employee with the employee ID 205. The function is hard coded to check for this employee ID only. If you want to check for any other employees, you will have to modify the function itself. You can solve this problem by declaring the function such that it accepts an argument. You can then pass the employee ID as parameter. 8-20 Copyright © 2004, Oracle. All rights reserved.
21.
8-21
Copyright © 2004, Oracle. All rights reserved.
22.
8-22
Copyright © 2004, Oracle. All rights reserved.
23.
8-23
Copyright © 2004, Oracle. All rights reserved.
24.
8-24
Copyright © 2004, Oracle. All rights reserved.
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