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27 lines
685 B
MySQL
27 lines
685 B
MySQL
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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(MIN(sl_p.best_before_date)) - JULIANDAY(MIN(sl_c.used_date)) AS shelf_life_days
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FROM stock_log sl_p
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JOIN (
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SELECT
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product_id,
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stock_id,
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MAX(used_date) AS used_date
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FROM stock_log
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WHERE transaction_type = 'consume'
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GROUP BY product_id, stock_id
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) sl_c
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ON sl_p.stock_id = sl_c.stock_id
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WHERE sl_p.transaction_type = 'purchase'
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GROUP BY sl_p.product_id, sl_p.stock_id
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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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