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select datepart(year,t.[日期]) '年份',datepart(month,t.[日期]) '月份',t.[入职人数],t.[离职人数] from
(
select (case when ([入职日期] IS NOT NULL AND [离职日期] IS NOT NULL) or ([入职日期] IS NOT NULL AND [离职日期] IS NULL) THEN [入职日期]
case when [入职日期] IS NULL AND [离职日期] IS NOT NULL THEN [离职日期] END) '日期',ISNULL([入职人数],0) '入职人数',ISNULL([离职人数],0) '离职人数'
from
(
select convert(varchar(7),[入职日期],120) '入职日期',sum(convert(varchar(7),[入职日期],120)) '入职人数'
from [入职表]
GROUP BY convert(varchar(7),[入职日期],120)
) a
full join
(
select convert(varchar(7),[离职日期],120) '离职日期',sum(convert(varchar(7),[离职日期],120)) '离职人数'
from [离职表] GROUP BY convert(varchar(7),[离职日期],120))
) b
on a.[入职日期]=b.[离职日期]
) t
--> 测试数据:[入职表]
IF OBJECT_ID('[入职表]') IS NOT NULL DROP TABLE [入职表]
GO
CREATE TABLE [入职表]([入职日期] DATETIME)
INSERT [入职表]
SELECT '2012-07-08' UNION ALL
SELECT '2012-07-12'
--------------开始查询--------------------------
--> 测试数据:[离职表]
IF OBJECT_ID('[离职表]') IS NOT NULL DROP TABLE [离职表]
GO
CREATE TABLE [离职表]([离职日期] DATETIME)
INSERT [离职表]
SELECT '2012-07-06' UNION ALL
SELECT '2012-06-01'
--------------开始查询--------------------------
SELECT DISTINCT YEAR(ISNULL(a.[入职日期],b.[离职日期])) AS 年,MONTH(ISNULL(a.[入职日期],b.[离职日期])) AS 月,
(select count(*) FROM [入职表] WHERE CONVERT(VARCHAR(7),[入职日期],120)=CONVERT(VARCHAR(7),a.[入职日期],120)) AS 入职人数 ,
(select count(*) FROM [离职表] WHERE CONVERT(VARCHAR(7),[离职日期],120)=CONVERT(VARCHAR(7),b.[离职日期],120)) AS 离职人数
FROM [入职表] AS a
FULL JOIN [离职表] AS b
ON CONVERT(VARCHAR(7),a.[入职日期],120)=CONVERT(VARCHAR(7),b.[离职日期],120)
----------------结果----------------------------
/*
年 月 入职人数 离职人数
----------- ----------- ----------- -----------
2012 6 0 1
2012 7 2 1
(2 行受影响)
*/