如何获取每个产品的所有变体，而不是多次获取产品名称

Question

我有3张桌子。

“table_products”

 product_id product_name
 1          A
 2          B
 3          C
 4          D
 5          E

“table_varients”

variant_id variant_name
 1          v1
 2          v2
 3          v3
 4          v4
 5          v5

“table_product_varients”

product_id variant_id
 1          1
 1          2
 1          3
 2          3
 2          4
 3          1
 3          4
 4          1
 5          1
 5          2

我希望选择查询的结果如下：

A - V1, V2, V3  
B - V3, V4
C - V1, V4
D - V1
E - V1, V2    

Devesh

Answer 1

简单连接，然后是GROUP_CONCAT

SELECT a.product_name, GROUP_CONCAT(c.variant_name)
FROM table_products a
INNER JOIN table_product_varients b ON a.product_id = b.product_id
INNER JOIN table_varients c ON b.variant_id = c.variant_id
GROUP BY a.product_name