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18 lines
482 B
MySQL
18 lines
482 B
MySQL
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DROP VIEW stock_average_product_shelf_life;
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CREATE VIEW stock_average_product_shelf_life
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AS
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SELECT
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p.id,
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CASE WHEN x.product_id IS NULL THEN -1 ELSE AVG(x.shelf_life_days) END AS average_shelf_life_days
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FROM products p
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LEFT JOIN (
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SELECT
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sl_p.product_id,
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JULIANDAY(sl_p.best_before_date) - JULIANDAY(sl_p.purchased_date) AS shelf_life_days
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FROM stock_log sl_p
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WHERE sl_p.transaction_type = 'purchase'
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AND sl_p.undone = 0
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) x
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ON p.id = x.product_id
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GROUP BY p.id;
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