無法獲得MySQL中的第n個結果

Question

我需要幫助獲取MySQL中結果的第n個數字。

我有三個表具有以下字段：

table1: product_id, name, description 

table2: category_id, name, description 

table3: product_id, category_id 

我想要得到這樣的結果：如下

name | description - product_category -category2 - category3 
    ___________________________________________________________________ 
    NAME 1 | Description 1 |  Cat1  | Cat2 | Cat5 
    NAME 2 | Description 2 |  Cat7  | Cat9 | Cat11 

我試圖使用的查詢是：

SELECT 
t1.name AS product_name, 
t1.description AS product_description, 
(SELECT t2.name from table2 order by name ASC LIMIT 1 
OFFSET 1) AS product_category, 

(SELECT t2.name from table2 order by name ASC LIMIT 1 
OFFSET 2) AS product_category2, 

(SELECT t2.name from table2 order by name ASC LIMIT 1 
OFFSET 3) AS product_category3 

FROM table1 t1 INNER JOIN 
table3 t3 
ON t3.product_id = t1.product_id INNER JOIN 
table2 t2 
ON t2.category_id = t3.category_id 
; 

不幸地我得到了這個結果：

name - description - category 

NAME 1 - Description 1 - Category 1 


NAME 2 - Description 2 - Category 2 

Answer 1

嘗試使用LEFT JOIN而不是INNER JOIN。

例子：

SELECT column_name(s) FROM table1 LEFT JOIN table2 ON table1.column_name = table2