按年份获取表组中的记录数答案

【问题标题】：Get the no of records in table group by year按年份获取表组中的记录数
【发布时间】：2018-06-24 19:46:51
【问题描述】：

考虑以下数据集。

表名：TBL_EMPLOYEE

EMP_NUMBER EMP_JOIN_DATE 001 2014-02-08 002 2014-03-15 003 2014-05-20 004 2015-05-24 005 2015-10-24 006 2017-01-30 007 2017-12-06

我需要拒绝。近10年入职员工人数如下

要求的结果

年（加入员工人数） 2018 0 2017 2 2016 0 2015 2 2014 3

我试过下面的sql。

SELECT top 10 DATEPART(yyyy, EMP_JOIN_DATE) AS RESIGN_YEAR,COUNT(EMP_NUMBER)AS COUNTT
FROM TBL_EMPLOYEE
WHERE DATEPART(yyyy, EMP_JOIN_DATE) <= 2018 
GROUP BY DATEPART(yyyy, EMP_JOIN_DATE)
ORDER BY EMP_JOIN_DATE DESC

但它返回以下结果

年（加入员工人数） 2017 2 2015 2 2014 3

【问题讨论】：

标签： sql-server sql-server-2012 group-by

【解决方案1】：

@Scrat，您可以使用参考文档中给出的数字表或SQL numbers table function

那么你可以在FROM子句中使用这个表作为主表，如下所示

select * from dbo.NumbersTable(2008,2018,1)

然后，您可以简单地 LEFT JOIN 加入您的表格和开发，并在几年内加入这两个

;with cte as (
SELECT top 10 DATEPART(yyyy, EMP_JOIN_DATE) AS RESIGN_YEAR,COUNT(EMP_NUMBER)AS COUNTT
FROM TBL_EMPLOYEE
WHERE DATEPART(yyyy, EMP_JOIN_DATE) <= 2018 
GROUP BY DATEPART(yyyy, EMP_JOIN_DATE)
)
select * 
from dbo.NumbersTable(2008,2018,1) nt
left join cte on nt.i = cte.RESIGN_YEAR
ORDER BY EMP_JOIN_DATE DESC

【讨论】：

【解决方案2】：

尝试以下查询：

WITH yearlist AS 
(
    SELECT (DATEPART(Year,getdate())-10) as year
    UNION all
    SELECT yl.year + 1 as year
    FROM yearlist yl
    WHERE yl.year + 1 <= YEAR(GetDate())
)

SELECT Y.year ,ISNULL(A.[No of Employees],0) [No of Employees]
FROM yearlist Y
LEFT JOIN
 ( 
SELECT YEAR(EMP_JOIN_DATE) [Year],Count(YEAR(EMP_JOIN_DATE)) [No of Employees]
FROM TBL_EMPLOYEE
WHERE DATEDIFF(YEAR,EMP_JOIN_DATE,GETDATE()) < 10
GROUP BY YEAR(EMP_JOIN_DATE)
 ) A ON A.Year = Y.year
ORDER BY Y.year DESC;

希望它有效！

【讨论】：

【解决方案3】：

我用另一种方式做到了..试试这个

SELECT @min_year = min(EMP_JOIN_DATE)
    ,@max_year = max(EMP_JOIN_DATE)
FROM @TBL_EMPLOYEE;

WITH CTE
AS (
    SELECT datepart(year, @min_year) AS yr

    UNION ALL

    SELECT yr + 1
    FROM CTE
    WHERE yr <= datepart(year, @max_year)
    )
SELECT TOP 10 yr AS RESIGN_YEAR
    ,COUNT(EMP_NUMBER) AS COUNTT
FROM CTE
LEFT JOIN @TBL_EMPLOYEE ON year(EMP_JOIN_DATE) = yr
WHERE yr <= 2018
GROUP BY yr
ORDER BY yr ASC

【讨论】：

【解决方案4】：

试试这个

DECLARE @Strt INT=2007,@End INT = 2017
;WITH YR
AS
(
    SELECT
       MyYear = @Strt

    UNION ALL

    SELECT
       MyYear = MyYear+1
       FROM YR
          WHERE MyYear < @End

)
SELECT
    YR.MyYear,
    JoinCnt = COUNT(EMP.EMP_NUMBER)
    FROM YR
       LEFT JOIN Tbl_EmploYee EMP
          ON YEAR(EMP.EMP_JOIN_DATE) = YR.MyYear
       GROUP BY YR.MyYear

【讨论】：