当COUNT（*）为NULL时在GROUP BY中返回0

因此，我将汇总内容从编辑内容切换到我的原始帖子，现在可以正常工作了：

询问

SELECt        CAST(a.IndexedDate as varchar) as dt,        COUNT(EventType) AS LoginsFROM         (        SELECt DISTINCT(IndexedDate)        FROM Table        WHERe IndexedDate > DATEADD(mm, -1, GETDATE())        ) aFULL OUTER JOIN (        SELECt *        FROM Table        WHERe IndexedDate > DATEADD(mm, -1, GETDATE())        AND EventType = 'Login'        ) bON         a.IndexedDate = b.IndexedDateGROUP BY        a.IndexedDateORDER BY        a.IndexedDate DESC

结果

2016-09-13    412016-09-12    312016-09-11    02016-09-10    02016-09-09    152016-09-08    36

请注意，我必须替换为

COUNT(*)

COUNT(EventType)