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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


Sample table: item_mast


Sample Solution:

SELECT item_mast.pro_name, pro_price, company_mast.com_name
   FROM item_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 Expression: Display the item name, price, and company name of all the products.

Relational Algebra Tree:

Relational Algebra Tree: Display the item name, price, and company name of all the products.

Practice Online


Query Visualization:

Duration:

Query visualization of Display the item name, price, and company name of all the products - Duration

Rows:

Query visualization of Display the item name, price, and company name of all the products - Rows

Cost:

Query visualization of Display the item name, price, and company name of all the products - Cost

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Previous SQL Exercise: Display each item producer company.
Next SQL Exercise: Display the average price of items of each company.

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SQL: Tips of the Day

Grouped LIMIT in PostgreSQL: Show the first N rows for each group?

db=# SELECT * FROM xxx;
 id | section_id | name
----+------------+------
  1 |          1 | A
  2 |          1 | B
  3 |          1 | C
  4 |          1 | D
  5 |          2 | E
  6 |          2 | F
  7 |          3 | G
  8 |          2 | H
(8 rows)

I need the first 2 rows (ordered by name) for each section_id, i.e. a result similar to:

id | section_id | name
----+------------+------
  1 |          1 | A
  2 |          1 | B
  5 |          2 | E
  6 |          2 | F
  7 |          3 | G
(5 rows)

PostgreSQL v9.3 you can do a lateral join

select distinct t_outer.section_id, t_top.id, t_top.name from t t_outer
join lateral (
    select * from t t_inner
    where t_inner.section_id = t_outer.section_id
    order by t_inner.name
    limit 2
) t_top on true
order by t_outer.section_id;

Database: PostgreSQL

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

 

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