需要帮助优化 T-SQL 查询

Question

以下是样本数据，

DECLARE @maxval int, @minval int
select @maxval=201301,@minval=201312

SELECT top 100001 CAST(((@maxval + 1) - @minval) *
    RAND(CHECKSUM(NEWID())) + @minval AS int)Date ,ceiling (RAND(CHECKSUM(NEWID())) *1000+25692*RAND(CHECKSUM(NEWID()))  )*ceiling (RAND(CHECKSUM(NEWID())) *1000+25692*RAND(CHECKSUM(NEWID()))  )ID
into #sample from sysobjects , syscolumns

问题：

• 有 2 列日期和 ID
• 获取第一个月的 id，例如 201302
• 需要在接下来的 3 个月内确定这些 ID 是否可用。所以这里是 201303,201304,201305
• 需要在所有月份重复此操作

这是我的代码，它需要更多的人工干预和时间。请帮忙。

select distinct   date from #sample order by DATE 

declare @processingdate varchar(6),@from varchar(6),@to varchar(6)
set @processingdate = '201302'
set @from = '201303'
set @to = '201305'


select distinct id into #Source from #sample where DATE = @processingdate
select distinct id into #lookup from #sample where DATE between @from and @to 

select @processingdate,count(*) from #Source where ID not in (select * from #lookup)

谢谢

Answer 1

试试这个：

select *
from #sample a
inner join #sample b
on a.ID = b.ID and a.Date IN (b.Date - 1, b.Date - 2, b.Date - 3)