CODEWITHSUNDEEP
mysqlgroup-bysumleft-join
shlagwuk
shlagwuk

Reputation: 93

Mysql sum of grouped data

I have the following tables:

products (id, name, price, category)

sales (product_id, timestamp)

I have to following summary of all my sales:

SELECT products.name AS products, TRUNCATE(products.price/100,2) as price, 
   COUNT(*) as sales_nbr, TRUNCATE(products.price/100*COUNT(*),2) as total
   FROM sales
   LEFT JOIN products ON sales.product_id=products.id
   GROUP BY product_id
   ORDER BY products.category

+-------------------+-------+-----------+--------+
| Products          | price | sales_nbr | total  |
+-------------------+-------+-----------+--------+
| Hot-dog           |  4.00 |    99     | 396.00 |
| Sandwich          |  4.00 |    64     | 256.00 |
| Croissant/brioche |  2.00 |    31     |  62.00 |
| Frites            |  5.00 |   106     | 530.00 |
...

I want the last row to be something like:

| TOTAL OF ALL SALES|       |   300     |1244.00 |
+-------------------+-------+-----------+--------+

I tried with SUM() and UNION, but nothing seems to be working :-)

Upvotes: 1

Views: 81

Answers (1)

sagi
sagi

Reputation: 40481

You should use ROLLUP which is explain here.

SELECT products.name AS products, TRUNCATE(products.price/100,2) as price, 
   COUNT(*) as sales_nbr, TRUNCATE(products.price/100*COUNT(*),2) as total
   FROM sales
   LEFT JOIN products ON sales.product_id=products.id
   GROUP BY product_id WITH ROLLUP
   ORDER BY products.category

Or, if you want just the two last columns to be summed you can do it with union

SELECT products.name AS products, TRUNCATE(products.price/100,2) as price, 
   COUNT(*) as sales_nbr, TRUNCATE(products.price/100*COUNT(*),2) as total
   FROM sales
   LEFT JOIN products ON sales.product_id=products.id
   GROUP BY product_id 
UNION ALL
SELECT 'TOTAL OF ALL SALES' , null, 
   COUNT(*) as sales_nbr, SUM(TRUNCATE(products.price/100,2)) as total
   FROM sales
   LEFT JOIN products ON sales.product_id=products.id
ORDER BY products.category

Upvotes: 1

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