選擇和計數通過

Question

類別

行我嘗試做一些代碼，但我發現了一些問題......

這是我的表....

類別表

+---------------------------+-----------------------+ 
+ id_category    + name     + 
+---------------------------+-----------------------+ 
+ 1      + Adidas    + 
+ 2      + Logo     + 
+ 3      + Levis    + 
+---------------------------+-----------------------+ 

項目表：

+---------+-----------------+-----------------------+ 
+ id_item + id_category + name     + 
+---------+-----------------+-----------------------+ 
+ 1  +  1   + T-Shirt003   + 
+ 2  +  2   + LogoShoes   + 
+ 3  +  3   + Panty003    + 
+---------------------------+-----------------------+ 

，我想打一個結果是這樣的：

No. Category   Total Item 
1.  Adidas    1 
2.  Logo    1 
3.  Levis    1 

任何人都可以幫助我嗎？

Answer 1

使用GROUP BY選項

SELECT 
    COUNT(item_table.id_category) as total, 
    category_table.name 
FROM 
    category_table 
    INNER JOIN item_table ON item_table.id_category = category_table.id_category 
GROUP BY 
    id_category