我有3個表中的數據:產品,訂閱和客戶重複行而獲取
SELECT id_product, product_sku
FROM product
JOIN (select fk_product_subscribed, fk_customer from subscription
where subscription.status = 'active')S
ON S.fk_product_subscribed = product.id_product
JOIN (select id_customer from customer
where email = '[email protected]')C
ON C.id_customer = S.fk_customer;
這我得到的結果是:
+ ---------- + ----------------------- +
| id_product | product_sku |
+ ---------- + ----------------------- +
| 100 | veggie for 3 happy meal |
| 100 | veggie for 3 happy meal |
+ ---------- + ----------------------- +
爲什麼我得到2行,而不是一個?
我也是這樣做的, SELECT id_product,pr oduct_sku 從產品 JOIN訂閱 ON subscription.fk_product_subscribed = product.id_product JOIN客戶 ON customer.id_customer = subscription.fk_customer WHERE customer.email = '[email protected]' 和subscription.status = '主動' ; 仍然相同的結果 – Rock
@ashutoshsingh,請參閱編輯如果有幫助的答案。 – Rahul
對不同的我甚至從我的查詢中得到正確的結果。我需要明白爲什麼沒有明顯的我在那裏得到兩行。我很新這裏 – Rock