Question

我需要做我认为简单的SQL查询...但我决定如何将它们分组：

    <p>I've got the below table:</p>

Company    | Airport    |     Type
------------------------------------------
SP1        | AP1        |     ST1             
SP1        | AP1        |     ST2        
SP1        | AP1        |     ST3        
SP1        | AP2        |     ST1         
SP1        | AP2        |     ST2        
SP1        | AP2        |     ST3 
SP1        | AP3        |     ST1 
SP1        | AP3        |     ST2 
SP1        | AP4        |     ST1 
SP1        | AP4        |     ST2 
SP1        | AP4        |     ST3 
SP1        | AP4        |     ST4

我希望按以下方式对AP和ST进行分组，以便所需的结果如下：

（案例1）

SP         | AP             |     ST
------------------------------------------
SP1        | AP1, AP2, AP4  |     ST1, ST2, ST3
SP1        | AP3            |     ST1, ST2        
SP1        | AP4            |     ST4

有什么想法？真的很感激！

更新

正如所指出的，结果还有另一种选择：

（案例2）

SP         | AP             |     ST
------------------------------------------
SP1        | AP1, AP2       |     ST1, ST2, ST3
SP1        | AP3            |     ST1, ST2        
SP1        | AP4            |     ST1, ST2, ST3, ST4

我还在列中添加了标题以提供更多上下文。这个想法只是为了能够对相关元素进行分组。我对这两个结果中的任何一个都感到满意，如果可能的话，我希望这两个结果都是......

Answer 1

没有描述为什么AP4 / ST4是一个特殊情况，但假设你试图在ST中为每个（sp，ap）分组3个连续元素：

SQL> with t (SP, AP, ST) as (
  2  select 'SP1','AP1','ST1' from dual union all
  3  select 'SP1','AP1','ST2' from dual union all
  4  select 'SP1','AP1','ST3' from dual union all
  5  select 'SP1','AP2','ST1' from dual union all
  6  select 'SP1','AP2','ST2' from dual union all
  7  select 'SP1','AP2','ST3' from dual union all
  8  select 'SP1','AP3','ST1' from dual union all
  9  select 'SP1','AP3','ST2' from dual union all
 10  select 'SP1','AP4','ST1' from dual union all
 11  select 'SP1','AP4','ST2' from dual union all
 12  select 'SP1','AP4','ST3' from dual union all
 13  select 'SP1','AP4','ST4' from dual
 14  )
 15  select sp, listagg(ap,',') within group (order by ap) lstap, lstst
 16  from (
 17  select sp, ap, listagg(st,',') within group (order by st) lstst from (
 18  select sp, ap, st, ceil((row_number() over(partition by sp, ap order by st))/3) grp
 19  from t
 20  )
 21  group by sp, ap, grp
 22  )
 23  group by sp, lstst
 24  order by 1,2,3
 25  /

SP  LSTAP                     LSTST                                             
--- ------------------------- -------------------------                         
SP1 AP1,AP2,AP4               ST1,ST2,ST3                                       
SP1 AP3                       ST1,ST2                                           
SP1 AP4                       ST4

P.S。对于替代结果输出：

SQL> with t (SP, AP, ST) as (
  2  select 'SP1','AP1','ST1' from dual union all
  3  select 'SP1','AP1','ST2' from dual union all
  4  select 'SP1','AP1','ST3' from dual union all
  5  select 'SP1','AP2','ST1' from dual union all
  6  select 'SP1','AP2','ST2' from dual union all
  7  select 'SP1','AP2','ST3' from dual union all
  8  select 'SP1','AP3','ST1' from dual union all
  9  select 'SP1','AP3','ST2' from dual union all
 10  select 'SP1','AP4','ST1' from dual union all
 11  select 'SP1','AP4','ST2' from dual union all
 12  select 'SP1','AP4','ST3' from dual union all
 13  select 'SP1','AP4','ST4' from dual
 14  )
 15  select sp, listagg(ap,',') within group (order by ap) lstap, lstst
 16  from (
 17  select sp, ap, listagg(st,',') within group (order by st) lstst from (
 18  select sp, ap, st
 19  from t
 20  )
 21  group by sp, ap
 22  )
 23  group by sp, lstst
 24  order by 1,2,3
 25  /

SP  LSTAP                     LSTST                                             
--- ------------------------- -------------------------                         
SP1 AP1,AP2                   ST1,ST2,ST3                                       
SP1 AP3                       ST1,ST2                                           
SP1 AP4                       ST1,ST2,ST3,ST4

按多个条件分组或连接多个列

1 个答案: