Question

在Sat / Sun上运行的计划作业之后，在前后状态下运行包含多行显示数据库表统计信息的查询。

Select [batchNum] ,[RunDate] ,[tableName] ,[numberofRows] ,[dataSize]
FROM TableNames
ORDER BY RunDate ASC

前/后按批号区分。例如，该表的批号为2-159。在哪里＆＃39; 158＆＃39;是之前的＆＃39;来自上周末运行的预定作业的作业/批次，批处理159将是之后的。

    batchNum    RunDate             tableName   numberofRows    dataSize 
    158         06/04/2017 04:30:51 TableData1  1700            104        
    158         06/04/2017 04:30:51 TableData2  1276             99
    158         06/04/2017 04:30:51 TableData3  1700            157        
    158         06/04/2017 04:30:51 TableData4   200             47        

    159         06/04/2017 05:30:51 TableData1  1500             85        
    159         06/04/2017 05:30:55 TableData2  1134             94        
    159         06/04/2017 05:30:57 TableData3  1500            101        
    159         06/04/2017 05:30:59 TableData4   167             40

由于批处理将始终是循环的，因此我想过滤此查询，以便在最近的一个周末只返回最近一次批处理的行。

Answer 1

Select [batchNum], [RunDate], [tableName], [numberofRows], [dataSize]
  FROM TableNames t1
 where not exists(select *
                    from TableNames t2
                   where t2.batchNum > t1.batchNum)
 ORDER BY RunDate ASC;

Answer 2

在select和所需的所有其他数据中创建一个子查询：

WHERE rownum = 1

然后在外部查询

中取

template<typename _Res, typename... _ArgTypes>
  template<typename _Functor, typename>
    function<_Res(_ArgTypes...)>::
    function(_Functor __f)
    : _Function_base()
    {
        typedef _Function_handler<_Signature_type, _Functor> _My_handler;

        // don't need to care about details below, but when it uses __f, it 
        // either uses std::move, or passes it by references
        if (_My_handler::_M_not_empty_function(__f))
        {
           _My_handler::_M_init_functor(_M_functor, std::move(__f));
           _M_invoker = &_My_handler::_M_invoke;
           _M_manager = &_My_handler::_M_manager;
        }
    }

Answer 3

您是否正在寻找最新的批次和状态记录，然后您可以查询如下：

Select top 1 [batchNum], [RunDate], [tableName], [numberofRows], [dataSize]
   From yourtable
   Order by BatchNum desc, RunDate desc

如果您要查找每个批次的最新RunDate记录，那么您可以查询如下：

Select top(1) with ties [batchNum], [RunDate], [tableName], [numberofRows], [dataSize] From yourtable
   Order by row_number() over(partition by BatchNum order by RunDate desc)

Answer 4

试试这个

select * from (
Select [batchNum] ,[RunDate] ,[tableName] ,[numberofRows] ,[dataSize],
row_number() over(partition by tableName  order by batchNum desc) rang
FROM TableNames
) tmp where rang=1

Answer 5

其他解决方案：

with maxi as
(
 select [tableName], max([batchNum]) MaxNum TableNames
 group by [tableName]
)
Select f1.*
FROM TableNames f1 
inner join maxi f2 on f1.tableName=f2.tableName and f1.batchNum=f2.MaxNum

如何筛选特定列的最新值

5 个答案: