Question

我想创建每小时报告，此查询运行正常。

SELECT 
    FORMAT(PingLogDate,'yyyy-MM-dd-HH:00:00') AS CalculatedTime, 
    COUNT(PingLogID) AS PingCount
FROM
    tbl_PingLog
GROUP BY 
    FORMAT(PingLogDate,'yyyy-MM-dd-HH:00:00')
ORDER BY 
    FORMAT(PingLogDate,'yyyy-MM-dd-HH:00:00')

但是我支持SQL Server 2008而Format是SQL Server 2012的新功能，所以我尝试了这段代码

SELECT 
    CAST(PingLogDate AS date) AS CalculatedDate, 
    DATEPART(hour, PingLogDate) AS CalculatedTime, 
    COUNT(PingLogID) AS PingCount
FROM
    tbl_PingLog
GROUP BY 
    CAST(PingLogDate AS date), DATEPART(hour, PingLogDate)
ORDER BY 
    CAST(PingLogDate AS date), DATEPART(hour, PingLogDate)

问题是不希望2列用于日期和小时，例如

第一个查询的结果是

CalculatedTime      | PingCount
--------------------+-----------
2017-11-07-12:00:00 | 359
2017-11-07-13:00:00 | 359
2017-11-07-14:00:00 | 350

第二个查询的结果是

CalculatedDate |CalculatedTime | PingCount
---------------+---------------+----------
2017-11-07     |12             | 359
2017-11-07     |13             | 359
2017-11-07     |14             | 350

我不想要第二个。我想要第一个。如何使用SQL Server 2008支持的工具。

Answer 1

您可以使用CONVERT将datetime列转换为yyyy-mm-dd hh:mi:ss(24h)格式，然后将该空格替换为-。

这样的事情：

SELECT REPLACE(CONVERT(VARCHAR(32), PingLogDate, 120), ' ', '-') AS CalculatedTime, 
       COUNT(PingLogID) AS PingCount
FROM tbl_PingLog
GROUP BY REPLACE(CONVERT(VARCHAR(32), PingLogDate, 120), ' ', '-')
ORDER BY REPLACE(CONVERT(VARCHAR(32), PingLogDate, 120), ' ', '-')

Answer 2

尝试使用转换和连接小时的方法。这将为您提供与SQL Server 2012中使用 FORMAT 方法相同的每小时和日期时间格式的ping计数：

var arr = [ "Kzljszzz15OFcln1XGM" , 
	{
		make: "John Deere ", 
		model: "5055", 
		uid: "Kzljszzz15OFcln1XGM",
		year: "1953"
	}
];

for(var prop in arr) {

	var cheackObjProp = (arr[prop] === "Kzljszzz15OFcln1XGM") ? true : false;
	var obj = {};

	//-------first index of arr----------
	if(cheackObjProp) {

	var objprop = arr[prop];

	//------second index of arr-----------
	}else {
		
		obj[objprop] = arr[prop];
	}

};

console.log(obj);

Answer 3

其他解决方案的简化版

SELECT 
    replace(convert(varchar(13),PingLogDate,120),' ','-')+':00:00'  AS CalculatedTime, 
    COUNT(PingLogID) AS PingCount
FROM
    tbl_PingLog
GROUP BY 
    convert(varchar(13),PingLogDate,120)
ORDER BY CalculatedTime

Answer 4

在代码中使用这个简单的语句怎么样？

declare @date datetime = getdate()
select DATEADD(dd, DATEDIFF(dd, 0, @date), 0)

结果将类似于2017-11-25 00:00:00.000

这是从datetime字段

缩短时间的最佳方法

如何按日期和小时分组：SQL Server 2008中的00:00

4 个答案: