SQL Exercise: Average price of all products of the given manufacturer

SQL Basic Select Statement: Exercise-26 with Solution.

From the following table, write a SQL query to calculate the average price for a manufacturer code of 16. Return avg.

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:

-- This query calculates the average value of the 'pro_price' column from the 'item_mast' table.
SELECT AVG(pro_price)
-- Specifies the table from which to retrieve the data (in this case, 'item_mast').
FROM item_mast
-- Filters the rows to only include those where the 'pro_com' column has the value 16.
WHERE pro_com = 16;

Output of the Query:

avg
500.0000000000000000

Code Explanation:

The said SQL query selects the average price of all items from the 'item_mast' table where the value of the "pro_com" column is equal to 16.

Relational Algebra Expression:

Relational Algebra Tree:

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