[英]SQL: Total days in a month
I have the following formula: 我有以下公式:
"Value1" * 100 * "Total day in a month" * "Value2"
I have the following table: 我有下表:
ID Date Time Value1 Value2
1 2014-01-01 00:00 10 20
2 2014-01-01 01:00 20 5
I want to select a data in a year with only using one parameter which is Year
. 我想在一年中选择一个数据,只使用一个参数,即
Year
。
How can I apply the formula into a query? 如何将公式应用于查询?
The result should be: 结果应该是:
ID Date Time Value1 Value2 TotalDayinMonth Result
1 2014-01-01 00:00 10 20 31 620000
2 2014-01-01 01:00 20 5 31 310000
ff.
You can get the number of days of a given date like this: 您可以像这样获得给定日期的天数:
DECLARE @date DATETIME = '2014-01-01'
SELECT DATEDIFF(DAY, @date, DATEADD(MONTH, 1, @date))
And the query: 和查询:
SELECT ID
,[Date]
,[Time]
,Value1
,Value2
,DATEDIFF(DAY, [Date], DATEADD(MONTH, 1, [Date])) AS TotalDayinMonth
,Value1 * 100 * DATEDIFF(DAY, [Date], DATEADD(MONTH, 1, [Date])) * Value2 AS Result
FROM yourTable
This expression will give you the number of days in the month that date
is in no matter what day it is: 此表达式将为您提供该
date
所在月份的天数,无论它是在哪一天:
datediff(day,
dateadd(month,datediff(month, 0, date),0),
dateadd(month,datediff(month, 0, date)+1,0))
Check this answer. 检查这个答案。 You can use
EOMONTH
AND DAY
function of SQL to get number of days in a month. 您可以使用SQL的
EOMONTH
AND DAY
函数来获取一个月内的天数。
SELECT ID
,[Date]
,[Time]
,Value1
,Value2
,DAY(EOMONTH(Date)) AS TotalDaysInMonth
,Value1 * 100 * DAY(EOMONTH(Date)) * Value2 AS Result
FROM TABLENAME
you can check this also. 你也可以检查一下。
declare @t table (ID int, Date date, Time time, Value1 int, Value2 int)
insert into @t values (1,'2014-01-01','00:00',10,20 ) , (2,'2014-01-01','00:00',20,5 ), (3,'2014-02-01','00:00',20,5 )
select * from @t
; with cte as
(
select id,
day(DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,DATE)+1,0))) Totaldayofmonth
from @t
)
--select * from cte
select
*, Value1 * 100 * Totaldayofmonth * Value2
from
@t t inner join cte on cte.ID = t.id
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