Question

我已经在SQL语句中及其周围阅读了关于循环（优点和缺点）的线程。我需要＆＃34;循环＆＃34;通过12小时，小时，小时，并想知道是否有比＃34; Do-While-Loop等更好的方式。这是我的SQL ......

SELECT R.FinalProd
, MIN(r.seqnumber) Seq
, MIN(S.RollRecID) RID
, COUNT(DISTINCT S.RollRecID) Pieces
, (MIN(r.seqnumber) + COUNT(DISTINCT S.RollRecID) - 1) endd
FROM NYS1Reheat1 R INNER JOIN NYS1SawPieces S ON R.RecordID = S.RollRecID INNER JOIN TensileProducts T ON R.FinalProd = T.SQLProduct
where s.ShiftIdent = '05/22/15154D' and r.Location = 'HISTORY'
and datepart(hour,s.prodtime) > 17 and datepart(hour,s.prodtime) < 19
GROUP BY R.FinalProd, T.FootWeight
order by RID

我需要从1700开始，然后按小时到0600。到目前为止，我的计划是＆＃34;循环＆＃34;通过代码12次。

谢谢，道格

Answer 1

您可以交叉加入您的时间间隔：

;with loop12 as (
   select 17 as f, 19 as t union all
   select 19 as f, 21 as t union all
   ...
)
SELECT R.FinalProd
, MIN(r.seqnumber) Seq
, MIN(S.RollRecID) RID
, COUNT(DISTINCT S.RollRecID) Pieces
, (MIN(r.seqnumber) + COUNT(DISTINCT S.RollRecID) - 1) endd
, loop12.f 
FROM NYS1Reheat1 R 
INNER JOIN NYS1SawPieces S ON R.RecordID = S.RollRecID
INNER JOIN TensileProducts T ON R.FinalProd = T.SQLProduct
CROSS JOIN loop12
WHERE s.ShiftIdent = '05/22/15154D' and r.Location = 'HISTORY'
and datepart(hour,s.prodtime) > loop12.f and datepart(hour,s.prodtime) < loop12.t
GROUP BY R.FinalProd, T.FootWeight
order by RID, loop12.f

Sql循环 - 除此之外

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