38 lines
1.2 KiB
SQL
38 lines
1.2 KiB
SQL
WITH
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most_recent_sales AS (
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SELECT DISTINCT ON (inventory_line)
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inventory_line, snack_sales_log_id, snack_sales_log_timestamp AS most_recent_sale
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FROM garfield.snack_sales_log
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ORDER BY inventory_line ASC, snack_sales_log_timestamp DESC
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),
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enhanced_overview AS (
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SELECT
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inventory_items.item_id,
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inventory_items.item_barcode,
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inventory_items.name,
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units_left,
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location_name,
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location,
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CASE
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WHEN snack_sales_log_id IS NULL THEN 0
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ELSE sales / (EXTRACT(EPOCH FROM most_recent_sale) - EXTRACT(EPOCH FROM bought)) * 24 * 3600
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END AS per_day
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FROM garfield.inventory_item_overview
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LEFT JOIN garfield.inventory_items USING (item_id)
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LEFT JOIN most_recent_sales ON item_id = inventory_line
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)
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SELECT
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*,
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CASE
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WHEN per_day = 0 THEN NULL
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ELSE GREATEST(0, units_left / per_day)
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END AS days_left,
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CASE
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WHEN per_day = 0 THEN NULL
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ELSE GREATEST(0, (60 - GREATEST(0, units_left / per_day)) * per_day)
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END AS for_two_months
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FROM enhanced_overview
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WHERE (%(location_id)s IS NULL OR location = %(location_id)s)
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ORDER BY days_left ASC, per_day DESC
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