MySQL 查詢 - 1 列上的多個 WHERE 子句

Question

誰能幫我根據下面的查詢建立一個查詢。

如您所見，我有一個產品，其中包含在前端建立的規格和某些組。 我知道問題所在，1 列不能同時為 2 個值，但我只需要這 2 個組中的那些產品。

為了說明，product_specification_sid，id 2 3 和 4 是尺寸，de rest 8 ~ 11 是 colors，所以我想 Z99938282F04071845941E18F216 的產品。

由於組（大小、顏色）將來可能會有所不同，因此不能選擇內部加入雙表。

SELECT
    products.*,
    categories.*,
    manufacturers.* 
FROM products
INNER JOIN  product_categories ON product_category_pid = product_id
INNER JOIN  categories ON product_category_cid = category_id
INNER JOIN  manufacturers ON product_manufacturer = manufacturer_id
INNER JOIN  product_specifications ON product_specification_pid=product_id
WHERE 
    product_active = 1  
AND 
(
    product_specification_sid in (3)  
AND  
    product_specification_sid in (8,9,6,7,10,11)  
) 
GROUP BY product_id

Answer 1

您可以改用 having 子句。

SELECT
    products.*,
FROM products
INNER JOIN  product_categories ON product_category_pid = product_id
INNER JOIN  categories ON product_category_cid = category_id
INNER JOIN  manufacturers ON product_manufacturer = manufacturer_id
INNER JOIN  product_specifications ON product_specification_pid=product_id
WHERE product_active = 1  
GROUP BY product_id
HAVING COUNT(CASE WHEN product_specification_sid in (3) THEN 1 END) > 0
 AND COUNT(CASE WHEN product_specification_sid in (8,9,6,7,10,11) THEN 1 END) > 0

Answer 2

據我了解，您正在尋找具有滿足特定條件的兩個匹配 product_specification 記錄的產品記錄。 在我看來，簡單的解決方案是：

SELECT products.*, categories.*, manufacturers.*  
FROM products
INNER JOIN  product_categories ON product_category_pid = product_id
INNER JOIN  categories ON product_category_cid = category_id
INNER JOIN  manufacturers ON product_manufacturer = manufacturer_id
INNER JOIN  product_specifications ps1 ON ps1.product_specification_pid=product_id
INNER JOIN  product_specifications ps2 ON ps2.product_specification_pid=product_id
WHERE      product_active = 1
  AND  ps1.product_specification_sid in (3)
  AND  ps2.product_specification_sid in (8,9,6,7,10,11)

順便說一句，那個“分組依據”是行不通的。 您必須按非聚合的所有內容進行分組，並且每個表必須至少有一個列，因此您至少有三個非聚合。 （好吧，也許 MySQL 在這里有一些擴展，但在標准 SQL 中是需要的。）