从数据库中挑选一个月内只出现一次的数据

Question

我有一张桌子，并且记录了银行交易。我想拉出一个月内只进行一次交易的用户。这意味着他们的交易次数= = 1当月。

我正在记录card_number，时间戳等。

Answer 1

SELECT * 
FROM transactions
GROUP BY card_number, month
HAVING COUNT(card_number) = 1

Answer 2

检查此

select     Card_Number,
           DATEPART(m, [TimeStamp] )MonthNo,
           COUNT(1) TxnCount
from       Transactions
group by   Card_Number,
           DATEPART(m, [TimeStamp] )
having     COUNT(1)=1

我假设您的表格结构如下所示。

Card_Number int, 
TimeStamp  datetime