Question

我需要查询帮助。我想按ID字段和日期字段的MIN（）对查询进行分组。但是，我想要将来所有日期的最小值。

我需要子查询吗？以下内容将排除将来不会发生的所有记录。

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

Answer 1

只需使用常规位置：

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

如果您需要每个公司代码都包含缺失项目的空值，您可以执行此操作

 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

将来日期的MIN（）的SQL查询

1 个答案: