Sql server 两个月前的数据

我有一个基本事务表，下面的查询为我提供了上一个整月的所有事务的计数：

Select count(status)
FROM TX 
WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)

我想要的是将该值与前一个整月的值进行比较，找出增加或减少的百分比

例如，我们在7月份，上面的查询将为我提供6月份ie 100的交易计数。我需要在2个月前计算5月份的总数，并找出%的差异。所以，如果五月是50，六月是100，那么查询应该返回100%

---

有什么想法吗？

试试下面的方法，应该可以，但不要认为这是最好的解决方案：

declare @lastMonth int = 
  (Select count(status)
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0))

declare @beforeLastMonth int = 
  (Select count(status)
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0))


declare @result int = (@lastMonth - @beforeLastMonth) * 100 / @beforeLastMonth

---

尝试以下方法，应该可以很好地工作，但不要认为这是最好的解决方案：

declare @lastMonth int = 
  (Select count(status)
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0))

declare @beforeLastMonth int = 
  (Select count(status)
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0))


declare @result int = (@lastMonth - @beforeLastMonth) * 100 / @beforeLastMonth

---

如果您只需要2个月，那么您可以尝试以下查询。否则，您可以添加系列1,2,3,4,5。。。然后用它代替固定整数：

CREATE TABLE tx
(
    status        CHAR(1)
  , date_reported DATE
);

INSERT INTO tx
VALUES ('A', '20180709')
     , ('B', '20180708')
     , ('A', '20180701')
     , ('B', '20180609')
     , ('A', '20180608')
     , ('A', '20180509')
     , ('B', '20180501');

  SELECT       SUM(months.is_last_month)
           , SUM(months.is_last2_month)
           , (SUM(months.is_last_month) - SUM(months.is_last2_month)) * 100 / SUM(months.is_last2_month)
  FROM       tx                                AS t
 OUTER APPLY (   SELECT CASE WHEN Date_Reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0)
                             AND  Date_Reported < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0) THEN 1
                        END AS is_last_month
                      , CASE WHEN Date_Reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0)
                              AND Date_Reported < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) THEN 1
                        END AS is_last2_month) AS months
 WHERE       t.date_reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0)
   AND       t.date_reported       < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0);

---

如果您只需要2个月，那么您可以尝试以下查询。否则，您可以添加系列1,2,3,4,5。。。然后用它代替固定整数：

CREATE TABLE tx
(
    status        CHAR(1)
  , date_reported DATE
);

INSERT INTO tx
VALUES ('A', '20180709')
     , ('B', '20180708')
     , ('A', '20180701')
     , ('B', '20180609')
     , ('A', '20180608')
     , ('A', '20180509')
     , ('B', '20180501');

  SELECT       SUM(months.is_last_month)
           , SUM(months.is_last2_month)
           , (SUM(months.is_last_month) - SUM(months.is_last2_month)) * 100 / SUM(months.is_last2_month)
  FROM       tx                                AS t
 OUTER APPLY (   SELECT CASE WHEN Date_Reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0)
                             AND  Date_Reported < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0) THEN 1
                        END AS is_last_month
                      , CASE WHEN Date_Reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0)
                              AND Date_Reported < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0) THEN 1
                        END AS is_last2_month) AS months
 WHERE       t.date_reported >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 2, 0)
   AND       t.date_reported       < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()), 0);

试试这个

with CurMon as (
  Select count(status) CurStat
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
  AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)
)
,
 PreMon as (
  Select count(status) PreStat
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
  AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
)

select  case when PreStat>0 then 100*(CurStat-  PreStat)/PreStat else 0 end as pct
from CurMon  join PreMon on 1=1

试试这个

with CurMon as (
  Select count(status) CurStat
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
  AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)
)
,
 PreMon as (
  Select count(status) PreStat
  FROM TX 
  WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
  AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
)

select  case when PreStat>0 then 100*(CurStat-  PreStat)/PreStat else 0 end as pct
from CurMon  join PreMon on 1=1

使用窗口功能：

with cte as(
select year(Date_reported) as [Year], month(Date_reported) as [Month], count(Status) as [StatusCount]
FROM TX
group by year(Date_reported), month(Date_reported)
)
Select [Year], [Month], [StatusCount]
    , 100.0*([StatusCount] - lag([StatusCount]) OVER (ORDER BY [Year], [Month]))/lag([StatusCount]) OVER (ORDER BY [Year], [Month]) as [PercentageDiff]
from cte

使用窗口功能：

with cte as(
select year(Date_reported) as [Year], month(Date_reported) as [Month], count(Status) as [StatusCount]
FROM TX
group by year(Date_reported), month(Date_reported)
)
Select [Year], [Month], [StatusCount]
    , 100.0*([StatusCount] - lag([StatusCount]) OVER (ORDER BY [Year], [Month]))/lag([StatusCount]) OVER (ORDER BY [Year], [Month]) as [PercentageDiff]
from cte

---

我建议您在pl/sql函数中执行此操作，因为这样更容易：

DECLARE
FUNCTION  this() RETURN float
IS
    month1 number;
    month2 number;
    increment float;
BEGIN

SELECT COUNT(status)
INTO month1
FROM TX 
WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)

SELECT COUNT(status)
INTO month2
FROM TX 
WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)

increment = month1 - month2;

RETURN (increment / month1) * 100;
END

---

如果没有表，仅在一个查询中尝试解决方案是很困难的，我建议您在pl/sql函数中尝试，因为这样更容易：

DECLARE
FUNCTION  this() RETURN float
IS
    month1 number;
    month2 number;
    increment float;
BEGIN

SELECT COUNT(status)
INTO month1
FROM TX 
WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)

SELECT COUNT(status)
INTO month2
FROM TX 
WHERE Date_Reported >= DATEADD(mm,DATEDIFF(mm,0,GETDATE())-2,0)
    AND Date_Reported < DATEADD(mm,DATEDIFF(mm,0,GETDATE())-1,0)

increment = month1 - month2;

RETURN (increment / month1) * 100;
END

---

如果没有表格，很难在一个查询中尝试解决方案

提供示例数据会很好。提供示例数据会很好。谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：谢谢您的帮助：@Taz欢迎您，但是我非常想念这些类型抱歉，这只是一个快速的模型谢谢你的帮助：@Taz不客气，但是我非常想念这些类型抱歉，这只是一个快速的模型