参数月份选择:查询显示前一个月,12个月前和过去12个月的平均值
我想玩我的Total_Sales表。 这是数据看起来的样子(使用SQL Server 2008 R2)参数月份选择:查询显示前一个月,12个月前和过去12个月的平均值
Name Year Month Sales
------ ---- ----- -----
Alfred 2011 1 100
Alfred 2011 2 200
Alfred 2011 3 300
Alfred 2011 4 400
Alfred 2011 5 500
Alfred 2011 6 600
Alfred 2011 7 700
Alfred 2011 8 800
Alfred 2011 9 900
Alfred 2011 10 500
Alfred 2011 11 500
Alfred 2011 12 500
的SQL查询我想创建应显示这样的数据:
Name Year Month Sales Prev_Month Month_Last_Year_Sales Last_12_Month_AVG
------ ---- ----- ----- ---------- --------------------- -----------------
Alfred 2011 1 100 NULL (year 2010, month 1) (2010_01 to 2011_01)/(12)
Alfred 2011 2 200 100 (year 2010, month 2) (2010_02 to 2011_02)/(12)
Alfred 2011 3 300 200 (year 2010, month 3) (2010_03 to 2011_03)/(12)
Alfred 2011 4 400 300 (year 2010, month 4) (2010_04 to 2011_04)/(12)
Alfred 2011 5 500 400 (year 2010, month 5) (2010_05 to 2011_05)/(12)
Alfred 2011 6 600 500 (year 2010, month 6) (2010_06 to 2011_06)/(12)
Alfred 2011 7 700 600 (year 2010, month 7) (2010_07 to 2011_07)/(12)
Alfred 2011 8 800 700 (year 2010, month 8) (2010_08 to 2011_08)/(12)
Alfred 2011 9 900 800 (year 2010, month 9) (2010_09 to 2011_09)/(12)
Alfred 2011 10 500 900 (year 2010, month 10) (2010_10 to 2011_10)/(12)
Alfred 2011 11 500 500 (year 2010, month 11) (2010_11 to 2011_11)/(12)
Alfred 2011 12 500 500 (year 2010, month 12) (2010_12 to 2011_12)/(12)
要复制的前一个月,我使用此:Copy prior month value and insert into new row
SELECT
TS.name,
TS.year,
TS.month,
TS.sales,
COALESCE(TS2.sales, 0) AS prior_month_sales
FROM
TotalSales TS
LEFT OUTER JOIN TotalSales TS2 ON
TS2.name = TS.name AND
(
(TS2.year = TS.year AND TS2.month = TS.month - 1) OR
(TS.month = 1 AND TS2.month = 12 AND TS2.year = TS.year - 1)
)
在Prev_Month的NULL是表明TOTAL_SALES开始在2011年第1个月,所以这个例子之前没有数据。
我打算使用一个参数,在其中选择一个月。
感谢您的帮助!
SELECT
[this_month].*,
[last_month].Sales AS [prev_month_sales],
[last_year].Sales AS [month_last_year_sales],
[yearly].AverageSales AS [last_12_month_average]
FROM
Total_Sales AS [this_month]
LEFT JOIN
Total_Sales AS [last_month]
ON [last_month].Name = [this_month].Name
AND (
([last_month].Year = [this_month].Year AND [last_month].Month = [this_month].Month - 1)
OR ([last_month].Year = [this_month].Year - 1 AND [last_month].Month = 12 AND [this_month].Month = 1)
)
LEFT JOIN
TotalSales AS [last_year]
ON [last_year].Name = [this_month].Name
AND [last_year].Year = [this_month].Year - 1
AND [last_year].Month = [this_month].Month
CROSS APPLY
(
SELECT
AVG(Sales) AS AverageSales
FROM
Total_Sales
WHERE
Name = [this_month].Name
AND (
(Year = [this_month].Year AND Month <= [this_month].Month)
OR (Year = [this_month].Year - 1 AND Month > [this_month].Month)
)
)
AS [yearly]
平均值不是12的值,因为前一年的数据并不总是12个月。但AVG()函数会为您提供帮助。
此外,我会高度推荐使用YEAR和MONTH字段。相反,我会建议使用日期时间字段来表示“月开始”,并使用SQL Server的日期函数...
Last Month : MonthStart = DATEADD(MONTH, -1, ThisMonth)
A Year Ago : MonthStart = DATEADD(YEAR, -1, ThisMonth)
Last Year : MonthStart > DATEADD(YEAR, -1, ThisMonth) AND MonthStart <= ThisMonth
另一个答案,我不知道是快或不...
WITH sales AS (
SELECT
ROW_NUMBER() OVER (PARTITION BY Name ORDER BY Year, Month) AS month_id,
*
FROM
yearly_sales
)
SELECT
Name = [this_month].Name,
Year = MAX([this_month].Year),
Month = MAX([this_month].Month),
Sales = MAX([this_month].Sales),
Last_Month = MAX(CASE WHEN [13_months].month_id = [this_month].month_id - 1 THEN [13_months].Sales END),
Last_Year = MAX(CASE WHEN [13_months].month_id = [this_month].month_id - 12 THEN [13_months].Sales END),
Yearly_AVG = AVG(CASE WHEN [13_months].month_id > [this_month].month_id - 12 THEN [13_months].Sales END)
FROM
Sales AS [this_month]
INNER JOIN
Sales AS [13_months]
ON [13_months].Name = [this_month].Name
AND [13_months].month_id <= [this_month].month_id
AND [13_months].month_id >= [this_month].month_id - 12
GROUP BY
[this_month].Name
Last_12_Months_AVG问题。这是否仅显示有12个月可用时间的值,并显示月份不足时显示为空/零? – AceAlfred
如所形成的,每个销售值都提供给AVG函数,或者替换为NULL,然后提供给AVG函数。 (CASE没有ELSE,但默认为在隐式ELSE语句中返回NULL。)AVG()函数忽略所有NULL(因此平均值为2,NULL仍为2)。如果提供给AVG()的所有值都为NULL,则结果为NULL - 但目前代码包含“本月”作为平均值的一部分,因此它始终具有至少一个实际值。 – MatBailie
我遇到了一个问题,也许你知道一个快速修复? 当员工尚未预订前一个月的销售时,没有要为此人显示的数据。有没有办法添加一行与失踪员工,其中“销售”设置为0,仍然拉动其他行的数据?例如, 2012年 - 第一个月 - 名称Alfred - 销售0 - 上一个500等 – AceAlfred
从AceAlfred - One problem I have run into, maybe you know a quick fix? When a employee has not booked his sales for a previous month there is no data to display for this individual. Is there a way to add a row with the missing employee, where the "sales" is set to 0 and still pull the data for the other rows? Ex. Year 2012 -- Month 1 -- Name Alfred -- Sales 0 -- Prev 500
一种方法是“修理”你的数据,以确保它总是有其价值。我建议在任何系统中填充数据。或者作为一个夜间批次来检查没有输入数据的人,并为你提供0(如果/当真实数据到达时更新)。但如果你不能...
CREATE TABLE agent (id INT, name NVARCHAR(128), start_date DATETIME, leave_date DATETIME);
-- populate with your agents
CREATE TABLE calendar (year DATETIME, month DATETIME, day DATETIME);
-- populate with all dates you want to report on
CREATE TABLE sales (agent_id INT, month_start DATETIME, total INT);
-- populate with your data
WITH new_raw_data AS
(
SELECT
agent.id AS [agent_id],
calendar.month AS [month_start],
COALESCE(sales.total, 0) AS [total]
FROM
agent
INNER JOIN
calendar
ON calendar.month_start >= COALESCE(DATEADD(month, -1, agent.start_date), '2000 Jan 01')
AND calendar.month_start <= COALESCE(agent.leave_date, '2079 Dec 31')
LEFT JOIN
sales
ON sales.agent_id = agent.id
AND sales.month_start = calendar.month_start
WHERE
calendar.month_start = calendar.day -- Only use records for the start of each month
)
,
<your other queries, using the nicely cleaned data, go here.>
你可以在报告服务,而不是SQL的聚合。获取两年数据和使用报告功能 – niktrs
这就是我的想法,但是为一个数据集创建查询不会更容易吗?我遇到的问题是Last_12_Month_AVG。 – AceAlfred
我设法完全通过报告服务完成 – niktrs