1
有没有另一种方法可以用更少的代码来总结计数?添加数值的计数
我使用一个视图(我唯一的选择),以试图找出如果客户在过去5历年中任意两个花的钱
表名: V_PERSON V_REVENUE
列: V_PERSON.ID
V.REVENUE.PersonID
V.REVENUE.Year1 revenue for the year (currently 2016)
V.REVENUE.Year2 revenue for the year (currently, 2015)
V.REVENUE.Year3
V.REVENUE.Year4
V.REVENUE.Year5
这是我已经试过:
SELECT V_PERSON.ID
FROM V_PERSON
WHERE
(
(
SELECT '1'
FROM V_REVENUE
WHERE V_REVENUE.PersonID = V_PERSON.ID
AND V_REVENUE.Year1 > 0
)
+
(
SELECT '1'
FROM V_REVENUE
WHERE V_REVENUE.PersonID = V_PERSON.ID
AND V_REVENUE.Year2 > 0
)
+
(
SELECT '1'
FROM V_REVENUE
WHERE V_REVENUE.PersonID = V_PERSON.ID
AND V_REVENUE.Year3 > 0
)
+
(
SELECT '1'
FROM V_REVENUE
WHERE V_REVENUE.PersonID = V_PERSON.ID
AND V_REVENUE.Year4 > 0
)
+
(
SELECT '1'
FROM V_REVENUE
WHERE V_REVENUE.PersonID = V_PERSON.ID
AND V_REVENUE.Year5 > 0
)
) >= 2
我喜欢这一个了。谢谢。 – 4ccc4