Getting a daily summary of figures from shop database - php

Question

I have the following tables, in a standard shop:
(id is always primary key, auto-increment, ts is always type TIMESTAMP, updated ON_UPDATE CURRENT_TIMESTAMP)
table sales:
id | total | tendered | flag | userID | ts
1 0.6 0.6 0 4 2013-11-21 08:12:23
Sales is the parent table, userID is related to the user that made the sale. total and tendered are both of type FLOAT. flag is of type VARCHAR and could be Free Order.
table receipts:
id | oID | pID | quantity | ts
1 1 26 1 2013-11-21 08:11:25
Receipts holds a line for each unique type of product sold. oID is type INT and relates to the id of table sales. pID is of type INT and relates to the id of table products.
table products:
id | name | price | cID | display | ts
1 Mars 0.6 3 1 2014-01-17 07:55:25
Products is the central data for each product in the database. Here is a line for mars bars. cID relates to the id in table categories.
table categories
id | name | display | ts
3 Snacks 1 2013-11-14 12:06:44
Categories is the table holding all the data about each category, and can have multiple products relating to a single row. display is of type INT and dictates when the category is enabled or disabled (1 = 'true')
My question is, I want to output information like this:
**Snacks**
(name) (quantity) (price) (total)
Fruit 3 50p £1.50
Twix 1 60p 60p
Boost 1 60 60p
**Hot Drinks**
(name) (quantity) (price) (total)
English Tea 15 60p £9.00
Speciality Teas 2 60p £1.20
Which I have the following SQL for:
SELECT categories.name AS category, products.name, pID,
(SELECT SUM(quantity) FROM receipts WHERE pID=r.pID AND DATE(ts) = CURDATE()) AS quantity,
products.price,r.ts
FROM receipts r
LEFT JOIN products ON r.pID = products.id
LEFT JOIN categories ON products.cID = categories.id
WHERE DATE(r.ts) = CURDATE()
GROUP BY r.pID
ORDER BY categories.name;
Which seems to give me the correct information, but I am not 100% certain. If anyone could verify that this works, I would be most grateful. But when I want to see a particular day, I get unusual figures with the following SQL:
$postfrom = $_POST['from_mm']."/".$_POST['from_dd']."/20".$_POST['from_yy'];
$postto = $_POST['to_mm']."/".$_POST['to_dd']."/20".$_POST['to_yy'];
$from = strtotime($postfrom . " 6:00");
$to = strtotime($postto . " 23:59");
$itemised = select("SELECT categories.name AS category, products.name, pID,
(SELECT SUM(quantity) FROM receipts WHERE pID = r.pID AND UNIX_TIMESTAMP(r.ts) > '{$from}' AND UNIX_TIMESTAMP(r.ts) < '{$to}')
AS quantity, products.price
FROM receipts r
LEFT JOIN products ON r.pID = products.id
LEFT JOIN categories ON products.cID = categories.id
WHERE UNIX_TIMESTAMP(r.ts) > '{$from}'
AND UNIX_TIMESTAMP(r.ts) < '{$to}'
GROUP BY r.pID
ORDER BY categories.name;");
(function 'select' simply returns an array of the SQL table). The thing is, I could find the results easily by looping through in PHP and adding it up that way. But I know this is possible with SQL, I just don't know why It isnt working. Can somebody please help?
Edit SQL sample fiddle is here: http://sqlfiddle.com/#!2/23af4 although I couldn't do more than half a day of data due to 8000 character restrictions.

Answer 1

Try this:
SELECT categories.name AS category, products.name AS name,
receipts.quantity AS quantity, products.price AS price,
(receipts.quantity * products.price) AS total
FROM categories
JOIN products
ON categories.id = products.cID
JOIN receipts
ON receipts.pID = products.ID
WHERE DATE(receipts.ts) = CURDATE()
ORDER BY categories.name
SQLFiddle demo
With regard to the date restriction, you could use BETWEEN ... AND ... to specify the date and time. Using an absolute date and time moment or relative to the current day and time, for example WHERE DATE(receipts.ts) BETWEEN concat(curdate() -5,' 6:00:00 AM') AND curdate() -4