从多个表中选择最大日期

Question

任何帮助都会非常感激。我正在尝试从一组表中选择最后一个活动日期。这些表格包括输入日期、注释日期、付款日期和索赔日期。我想只返回所有这些日期的最大值。此外，我只想要超过 45 天没有活动的记录。我目前正在使用以下 SQL 将所有日期带入，然后使用 EXCEL 中的计算字段来计算其余部分。这一切都可以用 SQL 来完成吗？

提前致谢。

SELECT xrxTrnLgr.PatId, xrxTrnLgr.Balance, 
       Max(xrxPatNotes.NoteDate) AS 'Max of NoteDate', 
       Max(xrxTrnIcf.PostDate) AS 'Max of IcfPostDate', 
       Max(xrxPat.EntryDate) AS 'Entry Date', 
       Max(xrxPat.Coverage) AS 'Coverage', 
       Max(xrxTrnPay.PostDate) AS 'Last Payment'
  FROM  xrxTrnLgr 
  LEFT OUTER JOIN xrxPatNotes ON xrxTrnLgr.PatId = xrxPatNotes.PatId
  LEFT OUTER JOIN  xrxTrnIcf ON xrxTrnLgr.PatId = xrxTrnIcf.PatId
  LEFT OUTER JOIN xrxPat ON xrxTrnLgr.PatId = xrxPat.PatId
  LEFT OUTER JOIN xrxTrnPay ON xrxTrnLgr.PatId = xrxTrnPay.PatId
  GROUP BY xrxTrnLgr.PatId, xrxTrnLgr.Balance
  HAVING (xrxTrnLgr.Balance>$.01)

Answer 1

我认为这可能在 SQL 中完成：

select t.patid, t.balance,
       max(case when which = 'note' then thedate end) as note,
       max(case when which = 'post' then thedate end) as post,
       max(case when which = 'entry' then thedate end) as entry,
       max(case when which = 'coverage' then thedate end) as coverage,
       max(case when which = 'lastPayment' then thedate end) as lastPayment
from xrxTrnLgr t left join
     ((select patid, notedate as thedate, 'note' as which
       from xrxPatNotes
      ) union all
      (select patid, postdate, 'post'
       from xrxtrnIcf
      ) union all
      (select patid, EntryDate, 'entry'
       from xrxPat
      ) union all
      (select paid, Coverage, 'coverage'
       from xrxPat.Coverage
      ) union all
      (select patid, PostDate, 'LastPayment'
       from xrxTrnPay.PostDate
      ) 
    ) d
    on t.patid = d.patid
group by t.patid, t.balance
having min(now() - thedate) >= 45