將來日期的MIN（）的SQL查詢

Question

我需要查詢的幫助。我想按ID字段和日期字段的MIN（）分組查詢。不過，我希望未來所有日期的最小值。

我需要一個子查詢嗎？以下內容將排除將來不會發生的所有記錄。

SELECT CompanyCode, MIN(NextDate) AS NextFollowUpDate 
FROM dbo.LeadNote AS LeadNote 
GROUP BY CompanyCode 
HAVING (MIN(NextDate) > GETDATE()) 

Answer 1

只需使用常規的地方：

SELECT CompanyCode, MIN(NextDate) AS NextFollowUpDate 
FROM dbo.LeadNote AS LeadNote 
WHERE NextDate > GETDATE() 
GROUP BY CompanyCode 

如果你需要用空的缺失項目每個公司代碼，你可以做到這一點

SELECT cc.CompanyCode, g.NextFollowUpDate 
FROM 
( 
    SELECT DISTINCT CompanyCode 
    FROM dbo.LeadNote 
) AS cc 
LEFT JOIN 
(
    SELECT CompanyCode, MIN(NextDate) AS NextFollowUpDate 
    FROM dbo.LeadNote 
    WHERE NextDate > GETDATE() 
    GROUP BY CompanyCode 
) AS g ON cc.CompanyCode = g.CompanyCode