Question

我有一张这样的表：

CustID     VisitTime
 1         2012-12-31 11:59
 1         2013-1-1 00:00
 1         2013-1-1 00:05
 2         2013-1-1 00:20
 2         2013-1-1 10:00
 3         2013-1-1 11:40

现在，我想选择那些访问过Jan 1st 12:00AM到Jan 31st 11:59pm网站的新客户。

例如：cust ID 1也访问了Dec，因此不应选择cust ID 1。只应选择2和3。

如何使用t-sql？

合并此逻辑

Answer 1

SELECt t.CustID
FROM Table1 t
GROUP BY t.CustID
HAVING MIN(VisitTime) >='01/01/2013 00:00:00' AND MIN(VisitTime) < '02/01/2013 00:00:00'
--same test on MAX(vistTime) if needed

SqlFiddle

Answer 2

SELECT DISTINCT CUSTID
FROM T as T1
WHERE VisitTime between '2013-01-01 00:00' AND '2013-01-31 23:59'
AND NOT EXISTS (SELECT T.CustID FROM T 
                       WHERE T.CustId=T1.CustId and VisitTime < '2013-01-01')

根据特定条件选择一行

2 个答案: