Question

我的表格employee包含name，startdate，endate列：

name | startdate   |  enddate
--------------------------------
A    | 12/12/2012  |  12/12/2014
B    | 05/08/2006  |  07/11/2009

我想要这样的结果：

name  |  Year of Employee
-------------------------
A     |     2012
A     |     2013 
A     |     2014 
B     |     2006
B     |     2007
B     |     2008 
B     |     2009

我必须在这里使用loop和/或cross join吗？

Answer 1

创建样本表

CREATE TABLE #test(name VARCHAR(10), startdate DATE, enddate DATE)

插入一些样本数据

INSERT INTO #test VALUES ('A', '12/12/2012', '12/12/2014')
                        ,('B', '05/08/2006', '07/11/2009')

使用递归CTE

;WITH CTE AS (
        SELECT  name, DATEPART(YEAR, startdate) AS yr FROM #test
        UNION ALL
        SELECT  #test.name, yr + 1
        FROM CTE
        INNER JOIN #test ON #test.name = CTE.name
        WHERE yr < DATEPART(YEAR, enddate)
        )
SELECT name, yr AS [Year of Employee]
FROM CTE
ORDER BY name, yr

输出

name    Year of Employee
A       2012
A       2013
A       2014
B       2006
B       2007
B       2008
B       2009

Answer 2

定义并填充提供此内容的CalYear表：

CalYearStartDate   CalYearEndDate
2005-01-01         2005-12-12
2006-01-01         2006-12-12
2007-01-01         2007-12-12
2008-01-01         2008-12-12
2009-01-01         2009-12-12
2010-01-01         2010-12-12
2011-01-01         2011-12-12
2012-01-01         2012-12-12
2013-01-01         2013-12-12
2014-01-01         2014-12-12

定义并填充提供此内容的Emp表：

EmpName  StartDate   EndDate
A        2012-12-12  2014-12-12
B        2006-05-08  2009-07-11

使用此查询来检索结果：

Select  EmpName,
        CalYearStartDate
From    Emp
Inner
Join    CalYear
on      YEAR(CalYearStartDate)  >= YEAR(Emp.StartDate)
and     YEAR(CalYearEndDate)    <= YEAR(Emp.EndDate)

Answer 3

创建声明：

CREATE TABLE #test(name VARCHAR(10), startdate DATE, enddate DATE)
INSERT INTO #test VALUES ('A', '12/12/2012', '12/12/2014')
                        ,('B', '05/08/2006', '07/11/2009')

查询：

SELECT t.name, YEAR(DATEADD(year,n.number, t.startdate)) AS Year
FROM #test t,
(SELECT number
FROM master..spt_values
WHERE [type] = 'P') n
WHERE startdate <= DATEADD(year,n.number, t.startdate)
AND enddate >= DATEADD(year,n.number, t.startdate)

结果：

name    Year
A       2012
A       2013
A       2014
B       2006
B       2007
B       2008
B       2009

获得每位员工整个任期的清单

3 个答案: