将表中的柱组返回多次相同的记录

Question

我有2个表INVENTORY和PRODUCTS我想选择INVENTORY的一些列和PRODUCTS中的一个。我写道：

SELECT INVENTORY.product, INVENTORY.version, PRODUCTS.customer 
FROM INVENTORY 
INNER JOIN PRODUCTS ON 
INVENTORY.product = PRODUCTS.product AND INVENTORY.version= PRODUCTS.version 

和我得到多倍相同的记录..我怎么解决它？

Answer 1

简单独特的或一组：

SELECT DISTINCT INVENTORY.product, INVENTORY.version, PRODUCTS.customer 
FROM INVENTORY 
INNER JOIN PRODUCTS ON 
INVENTORY.product = PRODUCTS.product AND INVENTORY.version= PRODUCTS.version 

或者：

SELECT INVENTORY.product, INVENTORY.version, PRODUCTS.customer 
FROM INVENTORY 
INNER JOIN PRODUCTS ON 
INVENTORY.product = PRODUCTS.product AND INVENTORY.version= PRODUCTS.version 
GROUP BY INVENTORY.product, INVENTORY.version, PRODUCTS.customer