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SQL: Display the average price of the items for each company

SQL Basic Select Statement: Exercise-29 with Solution.

From the following table, write a SQL query to calculate average price of the items for each company. Return average price and company code.

Sample table: item_mast

 

Sample Solution:

SELECT AVG(pro_price), pro_com
    FROM item_mast
GROUP BY pro_com;

Output of the Query:

avg					pro_com
250.0000000000000000			14
650.0000000000000000			12
3200.0000000000000000			15
5000.0000000000000000			11
1475.0000000000000000			13
500.0000000000000000			16

Relational Algebra Expression:

Relational Algebra Expression: Display the average price of the items for each company, showing only the company code.

Relational Algebra Tree:

Relational Algebra Tree: Display the average price of the items for each company, showing only the company code.

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Query Visualization:

Duration:

Query visualization of Display the average price of the items for each company, showing only the company code - Duration

Rows:

Query visualization of Display the average price of the items for each company, showing only the company code - Rows

Cost:

Query visualization of Display the average price of the items for each company, showing only the company code - Cost

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Previous: From the following table, write a SQL query to find the items whose prices are higher than or equal to $250. Order the result by product price in descending, then product name in ascending. Return pro_name and pro_price.
Next: From the following table, write a SQL query to find the cheapest item(s). Return pro_name and, pro_price.

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SQL: Tips of the Day

Can a foreign key be NULL and/or duplicate?

First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an Foreign key is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.

Ref: https://bit.ly/3uVu3OS