Question

我有以下TSQL语句，我试图弄清楚如何继续获取结果（一次100行），将它们存储在变量中（因为我必须在每次选择后添加总计）和继续在while循环中选择，直到找不到更多记录，然后将变量totals返回给调用函数。

SELECT [OrderUser].OrderUserId, ISNULL(SUM(total.FileSize), 0), ISNULL(SUM(total.CompressedFileSize), 0)
FROM 
(
 SELECT DISTINCT TOP(100) ProductSize.OrderUserId, ProductSize.FileInfoId, 
 CAST(ProductSize.FileSize AS BIGINT) AS FileSize, 
 CAST(ProductSize.CompressedFileSize AS BIGINT) AS CompressedFileSize
 FROM ProductSize WITH (NOLOCK)
 INNER JOIN [Version] ON ProductSize.VersionId = [Version].VersionId
) AS total RIGHT OUTER JOIN [OrderUser] WITH (NOLOCK) ON total.OrderUserId = [OrderUser].OrderUserId
WHERE NOT ([OrderUser].isCustomer = 1 AND [OrderUser].isEndOrderUser = 0 OR [OrderUser].isLocation = 1) 
AND [OrderUser].OrderUserId = 1
GROUP BY [OrderUser].OrderUserId

Answer 1

根据聚集索引，如果是编号为id，则使用下面的代码。如果是按日期，则以10 - 60分钟为增量。关注其他事情的表现，但是这段代码的可爱部分是你可以随时开始和停止，如果你把结果推到永久临时表（真正的表，只是临时）

以下是一个示例：

declare @count int
Declare @batch int
declare @max int

create table #temp (id int identity(1,1) primary key, Batch int, value int)


select @max = max(OrderUserId), @count = 0, @batch = 1000 from table

while (@count < @max)
begin

insert into #temp (batch,value)
select @count, Sum(stuffs)
from table
where orderId >= @count
 and orderid < @count + @batch

Set @count = @count + @batch

waitfor delay ('00:00:01')
Raiserror('On Batch %d',0,1,@Count) with nowait /* Will print progess */
end

而在SQL中循环总和

1 个答案: