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BEGIN TRANSACTION;
CREATE VIEW IF NOT EXISTS stock AS SELECT id, name, amount FROM products WHERE deprecated = 0 OR amount != 0;
CREATE VIEW IF NOT EXISTS purchaseprices AS SELECT product, SUM(price * amount) / SUM(amount) AS price FROM restock GROUP BY product;
CREATE VIEW IF NOT EXISTS invoice AS
SELECT user, timestamp, id AS productid, name AS productname,
CASE
WHEN user < 0 THEN
(SELECT price
FROM purchaseprices
WHERE purchaseprices.product = id)
else
(SELECT
CASE
WHEN user=0 THEN guestprice
else memberprice
END
FROM prices
WHERE product = id AND valid_from <= timestamp
ORDER BY valid_from DESC LIMIT 1)
END AS price
FROM sales INNER JOIN products ON sales.product = products.id
ORDER BY timestamp;
COMMIT;
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