我正在尝试在多对多表中获取所有一对一关系。
在下面的示例中,我想要返回的唯一记录是最后一个 (3,3)
PaymentID InvoiceID
1 1
1 2
2 2
3 3
我得到的最接近的是
Select * from Table where PaymentID in (
select PaymentID from Table t
inner join (
select InvoiceId from Table
group by InvoiceId
having count(InvoiceId) = 1
) inv on t.InvoiceId = inv.InvoiceId
group by PaymentId
having count(PaymentId) = 1
)
这将返回 1 和 3
非常感谢任何想法
谢谢。
最佳答案
SELECT *
FROM (
SELECT *,
COUNT(*) OVER (PARTITION BY paymentId) AS pcnt,
COUNT(*) OVER (PARTITION BY invoiceId) AS icnt
FROM mytable
) q
WHERE pcnt = 1
AND icnt = 1
关于sql-server - 获取多对多关系中两个字段上唯一的记录,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10848065/