Question

我是SQL新手，不知道如何从临时表中总结两列，欢迎任何帮助。

脚本如下：

SELECT
    Provider,
    StartYear,
    CAST(YEAR([EndYear]) AS INT) AS 'EndYear'
INTO 
    #a
FROM 
    TABLE1

SELECT
    *, SUM(EndYear - StartYear) AS 'Years'
FROM 
    #a

我收到错误消息：

a.provider在选择列表中无效，因为它未包含在聚合函数或GROUP BY子句中

样本数据

Provider    StartYear   EndYear 
A1          1940        15/04/2016 00:00 
A2          1930        08/06/2016 00:00 
A3          1932        04/06/2016 00:00 
A2          1932        15/06/2016 00:00 
A1          1944        01/07/2016 00:00

Answer 1

您不需要临时桌子。我想你想要这样的东西：

SELECT t1.*,
       (t1.EndYear - t1.StartYear) as Years
FROM table1 t1;

或：

SELECT t1.*,
       DATEDIFF(year, t1.StartYear, t1.EndYear) as Years
FROM table1 t1;

修改：如果您确实想要对这些值求和，只需删除t1.*并添加sum()：

SELECT SUM(t1.EndYear - t1.StartYear) as Years
FROM table1 t1;

在您的情况下，您应该修复列的名称。称为＆＃34;年＆＃34;不应该是约会时间。但是，很容易转换：

SELECT SUM(YEAR(t1.EndYear) - t1.StartYear) as Years
FROM table1 t1;

从临时表中总结两列

1 个答案: