MySQL - 如何将两个不同表中的数据放入一张表中

Question

我有下表

ps_ext_mod     ps_customer    ps_order_detail
---------      -----------    ---------------
id             .....          ..... 
cust      <==  email          .....
prod                  <==     product_reference

我需要将 email 中的数据添加到 cust 中，并将 product_reference 中的数据添加到 prod 中。
id 自动递增。

希望它应该看起来像这样:

ps_ext_mod
-----------
id | cust   | product
---------------------
1  | a@a.com | prod1
2  | a@a.com | prod2
3  | b@b.com | prod1
4  | c@c.com | prod3

Answer 1

INSERT INTO ps_ext_mod (email, product) SELECT
   c.email, d.product
   FROM ps_customer c
   INNER JOIN ps_order_detail d ON (d.customer_id = c.id) 

您需要稍微调整连接标准以匹配您的数据库结构。
如果两个表不相关，则使用如下查询:

INSERT INTO ps_ext_mod (email, product) SELECT
   c.email, d.product
   FROM ps_customer c
   CROSS JOIN ps_order_detail