的SQL Server 2008：計數的存儲類別

Question

我新的SQL Server和我得到了我困惑的一個問題記錄數。

我有2個數據表Category和Product。下面是詳細的表格。

類別：

------------------------------------------------------ 
categoryId | categoryName  | desc 
------------------------------------------------------ 
1   | Shirt    | Men's Shirt 
2   | Jeans    | Men's Pants 
3   | Accessories  | Women's Accessories 
------------------------------------------------------ 

產品

--------------------------------------------------------------- 
productID | desc      | categoryId 
--------------------------------------------------------------- 
1   | Slim-fit Classic Shirt | 1 
2   | Denim Slim-fit jeans  | 2 
3   | Denim Regular-fit jeans | 2 
4   | Bracelet     | 3 
--------------------------------------------------------------- 

我怎樣才能得到確切的輸出如下？

------------------------------------------------------------------- 
categoryId | categoryName  | numOfRecord | desc 
------------------------------------------------------------------- 
1   | Shirt    | 1   | Men's Shirt 
2   | Jeans    | 2   | Men's Pants 
3   | Accessories  | 1   | Women's Accessories 
------------------------------------------------------------------- 

對不起，我英文很差。

Answer 1

您可以使用COUNT和GROUP BY。

試試這個：

SELECT c.categoryId, c.categoryName, count(*) as numOfRecord, p.[desc] 
FROM dbo.Category AS c INNER JOIN dbo.Product AS p 
ON c.categoryId = p.categoryId 
GROUP BY c.categoryId, c.categoryName, p.[desc];