Question

我想编写一个显示五列的tsql脚本。第一列是日期，第二列是星期几，第三列是当月存在的一天中有多少，第四列是当天的重量，第五列是月份的重量（星期一到星期三得到15每个和周四到太阳各得10。实现这一目标的最简单，最快捷的方法是什么？

示例输出：

Date    Day_of_the_week Occurs_in_a_month   Weight_of_the_day   Weight_of_the_month
1/1/2015    Thursday    5   10  370
1/2/2015    Friday      5   10  370
1/3/2015    Saturday    5   10  370
1/4/2015    Sunday      4   10  370
1/5/2015    Monday      4   15  370
1/6/2015    Tuesday     4   15  370
1/7/2015    Wednesday   4   15  370
1/8/2015    Thursday    5   10  370
1/9/2015    Friday      5   10  370
1/10/2015   Saturday    5   10  370
1/11/2015   Sunday      4   10  370
1/12/2015   Monday      4   15  370
1/13/2015   Tuesday     4   15  370
1/14/2015   Wednesday   4   15  370
1/15/2015   Thursday    5   10  370
1/16/2015   Friday      5   10  370
1/17/2015   Saturday    5   10  370
1/18/2015   Sunday      4   10  370
1/19/2015   Monday      4   15  370
1/20/2015   Tuesday     4   15  370
1/21/2015   Wednesday   4   15  370
1/22/2015   Thursday    5   10  370
1/23/2015   Friday      5   10  370
1/24/2015   Saturday    5   10  370
1/25/2015   Sunday      4   10  370
1/26/2015   Monday      4   15  370
1/27/2015   Tuesday     4   15  370
1/28/2015   Wednesday   4   15  370
1/29/2015   Thursday    5   10  370
1/30/2015   Friday      5   10  370
1/31/2015   Saturday    5   10  370
2/1/2015    Sunday      4   10  340
2/2/2015    Monday      4   15  340
2/3/2015    Tuesday     4   15  340
2/4/2015    Wednesday   4   15  340
2/5/2015    Thursday    4   10  340
2/6/2015    Friday      4   10  340
2/7/2015    Saturday    4   10  340
2/8/2015    Sunday      4   10  340
2/9/2015    Monday      4   15  340
2/10/2015   Tuesday     4   15  340
2/11/2015   Wednesday   4   15  340
2/12/2015   Thursday    4   10  340
2/13/2015   Friday      4   10  340
2/14/2015   Saturday    4   10  340
2/15/2015   Sunday      4   10  340
2/16/2015   Monday      4   15  340
2/17/2015   Tuesday     4   15  340
2/18/2015   Wednesday   4   15  340
2/19/2015   Thursday    4   10  340
2/20/2015   Friday      4   10  340
2/21/2015   Saturday    4   10  340
2/22/2015   Sunday      4   10  340
2/23/2015   Monday      4   15  340
2/24/2015   Tuesday     4   15  340
2/25/2015   Wednesday   4   15  340
2/26/2015   Thursday    4   10  340
2/27/2015   Friday      4   10  340
2/28/2015   Saturday    4   10  340

。。。。比如2015年和2020年之间。

Answer 1

使用递归cte来构建日期列表..其余的只是窗口函数

WITH cteDates AS (
    SELECT CONVERT(DATE, '2015-01-01') AS [Date]
    UNION ALL
    SELECT DATEADD(DAY, 1, [Date])
    FROM cteDates
    WHERE   DATEADD(DAY, 1, [Date]) < '2021-01-01'
),
cteWeights AS (
    SELECT  [Date], 
            DATENAME(weekday, [Date]) [Day_of_the_week],
            COUNT(*) OVER (PARTITION BY DATEPART(MONTH, [Date]), DATEPART(YEAR, [Date]),DATENAME(weekday, [Date])) [Occurs_in_a_month],
            (CASE WHEN DATENAME(weekday, [Date]) IN ('Monday', 'Tuesday', 'Wednesday') THEN 15 ELSE 10 END)  [Weight_of_the_day]
    FROM cteDates
)
SELECT *, 
       SUM([Weight_of_the_day]) OVER (PARTITION BY DATEPART(MONTH, [Date]), DATEPART(YEAR, [Date])) [ Weight_of_the_month]
FROM cteWeights
ORDER BY [Date]
OPTION (MAXRECURSION 0)

每日谷物的月重量

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