Question

我对sql查询有疑问。在这种情况下，我需要获取最近历史活动是14天前的用户，但我的历史记录是空的，我可以做如下操作：如果电子邮件历史记录在第14天是空的，则选择没有电子邮件历史记录

SELECT st.id, st.firstName, st.lastName, st.email, st.lastLogin, st.phone,  st.gender, sa.title,bra.Title as brand, ss.SaleDate, teh.sDate, sa.imageUrl, sa.guid, st.mallId, sa.id saleId 
FROM dbo.Users st 
INNER JOIN KEY_SalesToUsers ss ON (st.ID=ss.userID) 
INNER JOIN Sales sa ON (sa.ID=ss.SaleID) 
INNER JOIN Brands bra ON (sa.BrandID=bra.ID) 
INNER JOIN dbo.UserEmailHistory teh ON st.id = teh.userId 
WHERE CONVERT(date,DATEADD(day,1,ss.SaleDate))= CONVERT(date,getdate()) 
AND teh.sDate >= dateadd(dd,-14,getdate()) 
AND teh.sDate <=  dateadd(dd,-13,getdate()) 
AND sDate <=  dateadd(dd,-1,getdate()) 
ORDER BY ss.SaleDate DESC

Answer 1

而不是

INNER JOIN dbo.UserEmailHistory teh ON st.id = teh.userId

尝试使用

LEFT OUTER JOIN dbo.UserEmailHistory teh ON st.id = teh.userId

Answer 2

您应该再次阅读LEFT JOIN和INNER JOIN差异，还必须更改where条件。您无需通过＆lt;＆gt;进行检查两次。如果这一天对于您将日期转换为日期格式很重要，然后进行检查。表现会增加。

Answer 3

SELECT st.id, st.firstName, st.lastName, st.email, st.lastLogin, st.phone,  st.gender, sa.title,bra.Title as brand, ss.SaleDate, teh.sDate, sa.imageUrl, sa.guid, st.mallId 
    FROM dbo.Users st 
    INNER JOIN KEY_SalesToUsers ss ON (st.ID=ss.userID) 
    INNER JOIN Sales sa ON (sa.ID=ss.SaleID) 
    INNER JOIN Brands bra ON (sa.BrandID=bra.ID) 
    LEFT OUTER JOIN dbo.UserEmailHistory teh ON st.id = teh.userId 
    WHERE CONVERT(date,DATEADD(day,1,ss.SaleDate))=CONVERT(date,getdate()) 
    AND IsNull(sDate, '') = '' OR CONVERT(date,DATEADD(day,14,teh.sDate))=CONVERT(date,getdate())  
    ORDER BY ss.SaleDate DESC

SQL查询选择列表是否为空

3 个答案: