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URI Problem 2609 Solution Products by Categories - URI Online Judge Solution


URI Online Judge Solution 2609 Products by Categories 
Using PostgreSQL Query Language.

As usual the sales industry is doing an analysis of how many products we have in stock, and you can help them. 
Then your job will display the name and amount of products of each category.

Schema

products
ColumnType
id (PK)numeric
namevarchar
amountnumeric
pricenumeric
id_categories (FK)numeric
 
categories
ColumnType
id (PK)numeric
namevarchar

Tables

products
idnameamountpriceid_categories
1Two-doors wardrobe1008001
2Dining table10005603
3Towel holder1000025.504
4Computer desk350320.502
5Chair3000210.644
6Single bed7504601
 
categories
idname
1wood
2luxury
3vintage
4modern
5super luxury

Output Sample

namesum
luxury350
modern13000
wood850
vintage1000
 

URI 2609 Solution in SQL:


SELECT categories.name,sum(amount) "sum"
FROM products
INNER JOIN categories on products.id_categories=categories.id
GROUP BY categories.name;

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