SQL Exercise: Find employees and departments with a given budget

SQL JOINS: Exercise-28 with Solution

From the following tables write a SQL query to find the departments with budgets more than Rs. 50000 and display the first name and last name of employees.

Sample table: emp_department

DPT_CODE DPT_NAME        DPT_ALLOTMENT
-------- --------------- -------------
      57 IT                      65000
      63 Finance                 15000
      47 HR                     240000
      27 RD                      55000
      89 QC                      75000

Sample table: emp_details

 EMP_IDNO EMP_FNAME       EMP_LNAME         EMP_DEPT
--------- --------------- --------------- ----------
   127323 Michale         Robbin                  57
   526689 Carlos          Snares                  63
   843795 Enric           Dosio                   57
   328717 Jhon            Snares                  63
   444527 Joseph          Dosni                   47
   659831 Zanifer         Emily                   47
   847674 Kuleswar        Sitaraman               57
   748681 Henrey          Gabriel                 47
   555935 Alex            Manuel                  57
   539569 George          Mardy                   27
   733843 Mario           Saule                   63
   631548 Alan            Snappy                  27
   839139 Maria           Foster                  57

Sample Solution:

-- Selecting specific columns and renaming them for clarity
SELECT emp_details.emp_fname AS "First Name", emp_lname AS "Last Name"
-- Specifying the tables to retrieve data from ('emp_details' and 'emp_department')
FROM emp_details 
-- Performing an inner join based on the equality of 'emp_dept' in 'emp_details' and 'dpt_code' in 'emp_department'
INNER JOIN emp_department
ON emp_details.emp_dept = emp_department.dpt_code
-- Adding an additional condition to the join, filtering based on 'dpt_allotment' greater than 50000
AND emp_department.dpt_allotment > 50000;

Output of the Query:

First Name	Last Name
Alan		Snappy
Maria		Foster
Michale		Robbin
Enric		Dosio
Joseph		Dosni
Zanifer		Emily
Kuleswar	Sitaraman
Henrey		Gabriel
Alex		Manuel
George		Mardy

Explanation:

The said SQL query is selecting specific columns from the emp_details table and renaming them as 'First Name' and 'Last Name'. It then joins the emp_details table with the emp_department table based on a matching value in the 'emp_dept' column of the emp_details table and the 'dpt_code' column of the emp_department table. The query also includes a filter that only returns the rows where the 'dpt_allotment' column in the emp_department table is greater than 50000.
The INNER JOIN clause is used which is used to only return the rows where there is a match in both tables, it discards the unmatched rows from both tables.

Practice Online

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