Question

我有一个运行良好的MS Access查询，但是我不知道如何在SQL Server中编写此查询。

MS Access查询：-

SELECT lp.PortfolioID, 
       Count(IIf(lp.Data_Status = 'Prelim Collection', 1, Null)) AS Prelim_Collection_Cnt, 
       Count(IIf(lp.Data_Status = 'Final Collection', 1, Null)) AS Final_Collection_Cnt, 
       Count(IIf(lp.Data_Status = 'Prelim Entry', 1, Null)) AS Prelim_Entry_Cnt, 
       Count(IIf(lp.Data_Status = 'Final Entry', 1, Null)) AS Final_Entry_Cnt, 
       Count(IIf(lp.Data_Status = 'Prelim QC', 1, Null)) AS Prelim_QC_Cnt, 
       Count(IIf(lp.Data_Status = 'Final QC', 1, Null)) AS Final_QC_Cnt
FROM (
      SELECT DISTINCT p.PortfolioID, p.Data_Status 
      FROM Late_Portfolios AS p 
      WHERE p.TimeStamp BETWEEN #10/01/2018# AND #10/31/2018#)  AS lp
GROUP BY lp.PortfolioID;

Answer 1

您最好的选择是切换到CASE语句，因为这些语句几乎可以在阳光下的每个RDBMS中使用（Access除外...我无法想象为什么它仍然不支持此功能，但这就是您的MS）。除此之外，您还想将日期文字转换为ISO8601格式YYYY-MM-DD并将其封装在单引号而不是哈希中。

SELECT lp.PortfolioID,  
    COUNT(CASE WHEN lp.Data_Status = 'Prelim Collection' THEN 1 END) AS Prelim_Collection_Cnt, 
    COUNT(CASE WHEN lp.Data_Status = 'Final Collection' THEN 1 END) AS Final_Collection_Cnt, 
    COUNT(CASE WHEN lp.Data_Status = 'Prelim Entry' THEN 1 END) AS Prelim_Entry_Cnt, 
    COUNT(CASE WHEN lp.Data_Status = 'Final Entry' THEN 1 END) AS Final_Entry_Cnt, 
    COUNT(CASE WHEN lp.Data_Status = 'Prelim QC' THEN 1 END) AS Prelim_QC_Cnt, 
    COUNT(CASE WHEN lp.Data_Status = 'Final QC' THEN 1 END) AS Final_QC_Cnt
FROM
    (
        SELECT DISTINCT 
            p.PortfolioID, 
            p.Data_Status 
        FROM Late_Portfolios AS p 
        WHERE p.TimeStamp BETWEEN '2018-10-01' AND '2018-10-31'
    )  AS lp
GROUP BY lp.PortfolioID;

Answer 2

我的解析器仅抱怨您的日期，可以使用“ yyyymmdd”

'SELECT ... WHERE discovery_time > 1800'

Answer 3

该逻辑也应在SQL Server中起作用，如果您的版本较低，则可以进行条件聚合：

select lp.PortfolioID,
       sum(case when lp.Data_Status = 'Prelim Collection' then 1 else 0 end),
from ( <query> )  AS lp
group by lp.PortfolioID;

只需以20180110格式ANSI SQL传递您的日期：

where p.TimeStamp >= '20180110' AND p.TimeStamp >= '20181031'

如何在SQL Server中编写我的MS Access查询？

3 个答案: