将表中的colums组合返回多次相同的记录

Question

我有2个表INVENTORY和PRODUCTS，我想要选择INVENTORY的一些列和PRODUCTS中的一列。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

我得到了相同记录的多次..我是如何解决的？

Answer 1

简单分明或分组：

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