SQL Exercise: Display the item name, price, and company name

SQL JOINS: Exercise-22 with Solution

Write a SQL query to display the item name, price, and company name of all the products.

Sample table: company_mast

COM_ID COM_NAME
------ -------------
    11 Samsung
    12 iBall
    13 Epsion
    14 Zebronics
    15 Asus
    16 Frontech

Sample table: item_mast

 PRO_ID PRO_NAME                       PRO_PRICE    PRO_COM
------- ------------------------- -------------- ----------
    101 Mother Board                    3200.00         15
    102 Key Board                        450.00         16
    103 ZIP drive                        250.00         14
    104 Speaker                          550.00         16
    105 Monitor                         5000.00         11
    106 DVD drive                        900.00         12
    107 CD drive                         800.00         12
    108 Printer                         2600.00         13
    109 Refill cartridge                 350.00         13
    110 Mouse                            250.00         12

Sample Solution:

-- Selecting specific columns from the result of an inner join between 'item_mast' and 'company_mast' tables
SELECT item_mast.pro_name, pro_price, company_mast.com_name
-- Specifying the tables to retrieve data from ('item_mast' as the left table and 'company_mast' as the right table)
FROM item_mast 
-- Performing an inner join based on the equality of 'pro_com' in 'item_mast' and 'com_id' in 'company_mast'
INNER JOIN company_mast
ON item_mast.pro_com = company_mast.com_id; 

Output of the Query:

pro_name		pro_price	com_name
Mother Board		3200.00		Asus
Key Board		450.00		Frontech
ZIP drive		250.00		Zebronics
Speaker			550.00		Frontech
Monitor			5000.00		Samsung
DVD drive		900.00		iBall
CD drive		800.00		iBall
Printer			2600.00		Epsion
Refill cartridge	350.00		Epsion
Mouse			250.00		iBall

Explanation:

The said SQL query that retrieves specific columns from the table item_mast and company_mast and the INNER JOIN clause to combine the data based on the join condition specified in the ON clause.
The selected columns are 'pro_name' from item_mast, 'pro_price' from item_mast and 'com_name' from company_mast. The join condition is that the 'pro_com' column in the item_mast table matches the 'com_id' column in the 'company_mast' table.
The result of the query is a new table that contains the specified columns from both item_mast and company_mast, with rows that have matching values in the specified columns.

Relational Algebra Expression:

Relational Algebra Tree:

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