SQL中具有单独条件的筛选器列

我试图从表中查找登录和注销时间。我能够计算出登录和注销时间

你可以看到下面的链接

解决办法是

    SELECT DISTINCT AGENTID, CAST(EVENTDATETIME AS date) AS [Date], 
MIN([EVENTDATETIME]) OVER (PARTITION BY [AGENTID], CAST(EVENTDATETIME AS date) ORDER BY [EVENTTYPE]) AS first_login, 
MAX([EVENTDATETIME]) OVER (PARTITION BY [AGENTID], CAST(EVENTDATETIME AS date) ORDER BY [EVENTTYPE] DESC) AS last_logout,
FROM #temp

现在，我假设通过EVENTTYPE=1第一次登录和最后一次注销通过EVENTTYPE=1执行此筛选列

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您能建议一种方法吗。

在

MIN

和

MAX

窗口函数中使用

case

表达式

SELECT DISTINCT 
AGENTID, 
CAST(EVENTDATETIME AS date) AS [Date], 
MIN(CASE WHEN EVENTTYPE = 1 THEN [EVENTDATETIME] END) OVER(PARTITION BY [AGENTID], CAST(EVENTDATETIME AS date)) AS first_login, 
MAX(CASE WHEN EVENTTYPE = 1 THEN [EVENTDATETIME] END) OVER(PARTITION BY [AGENTID], CAST(EVENTDATETIME AS date)) AS last_logout
FROM #temp

如果无法在创建#temp时进行筛选，则可以在子查询中使用它。将from#temp替换为from（选择…from#temp Where filter…）