總計mysql組

Question

此mysql查詢提供了按天和小時分組的我的產品（總數和total_staff）的銷售數量。 我想要每種產品的total和total_staff的總和（不按任何內容分組，按ID期望）。 我可以在同一查詢中執行此操作嗎？

SELECT p.name, p.color, DATE(date_create) as jour,HOUR(date_create) AS h,
SUM(CASE WHEN s.staff=0 THEN 1 ELSE 0 END) as total,
SUM(CASE WHEN s.staff=1 THEN 1 ELSE 0 END) as total_staff
FROM manifsSubCategories msc
LEFT JOIN products_subCategories psc ON msc.id=psc.manifSubCategory_id
LEFT JOIN sales s ON psc.product_id=s.product_id
LEFT JOIN products p ON psc.product_id=p.id
LEFT JOIN manifsCategories ON manifCategory_id=manifsCategories.id
WHERE manifCategory_id=1 AND s.category_id=1 GROUP BY jour,h ORDER BY p.id DESC 

Answer 1

只需省略其他列：

SELECT p.name,
    SUM(CASE WHEN s.staff=0 THEN 1 ELSE 0 END) as total,
    SUM(CASE WHEN s.staff=1 THEN 1 ELSE 0 END) as total_staff
FROM manifsSubCategories msc
LEFT JOIN products_subCategories psc ON msc.id=psc.manifSubCategory_id
LEFT JOIN sales s ON psc.product_id=s.product_id 
LEFT JOIN products p ON psc.product_id=p.id
LEFT JOIN manifsCategories ON manifCategory_id=manifsCategories.id
WHERE manifCategory_id=1 AND s.category_id=1
GROUP BY p.name
ORDER BY p.id DESC

順便說一句-您的WHERE子句是錯誤的。 您正在按LEFT JOIN的表進行過濾，由於NULL比較，這將使您的LEFT JOIN變為inner join LEFT JOIN 。
左聯接的右表上的條件應僅放在ON子句中。