小编Jac*_*cob的帖子

当谈到在 T-SQL 中循环遍历大量数据时，我在 Internet 上看到的大多数示例都使用这样的模式：

declare @someVariable int
declare @remainingRows int

select someColumn from someTables into #someTempTable

select @remainingRows = count(*) from #someTempTable
while @remainingRows > 0 begin

    select top 1 @someVariable = someColumn from #someTempTable

    -- Do stuff

    delete top 1 from #someTempTable

    select @remainingRows = count(*) from #someTempTable
end

这似乎比使用这样的游标的示例更常见：

declare @someVariable int

select someColumn from someTables into #someTempTable

declare @someCursor cursor for select someColumn from #someTempTable
open @someCursor
fetch next @someVariable from @someCursor

while @@fetch_status = 0 …