Question

假设我的数据库数据结构是那样的

ShopId   Transaction

001       1.000    
001       2.000
001       3.000
002       1.000
002       2.000
002       3.000

现在可能有一些交易丢失了，假设

002       4.000
002       6.000

在上表中，缺少表的5.000事务。

我想编写一个查询，在我的数据库中找到上面缺少的序列号。

所以我的查询将返回结果

   shopid     transaction
   002       5.000

Answer 1

获取每ShopId个缺失交易的数量：

  SELECT ShopId
       , count(*) 
           - max([Transaction])
           + min([Transaction])
           - 1 as MissingTranCount
    FROM yourtable
GROUP BY ShopId

获取遗失的交易：

1。Generate table #numbers

2.Generate #shops：

  SELECT ShopId as id
    into #shops
    FROM yourtable
GROUP BY ShopId
  HAVING count(*) 
           - max([Transaction])
           + min([Transaction])
           - 1 > 0

3.获取遗失的交易：

  SELECT id
       , number
    FROM #numbers
   cross join #shops shops
   WHERE exists (SELECT 1
                   FROM yourtable
                  WHERE ShopId = id
                    and number < [Transaction]
                )
     and exists (SELECT 1
                   FROM yourtable
                  WHERE ShopId = id
                    and number > [Transaction]
                )
     and not exists (SELECT 1
                       FROM yourtable
                      WHERE ShopId = id
                        and number = [Transaction]
                )

在数据库中查找缺少的序列号

1 个答案: