SQL Server - 行分栏（分组）

Question

我试图使用PIVOT将我的一些行组合到列中，但事情是，我必须将它们分组，并且我无法弄清楚我该怎么做它。

SQL查询：

select res.tipo, 
      it.itemname as item, 
      sum(resi.quantity) as qt 
from Reserve as res inner join 
      ReserveItems as resi on res.id_reserve = resi.id_reserve inner join 
      Items as it on resi.defindex = it.defindex 
where res.situacao = 3 
group by res.tipo, it.id, it.itemname 
order by tipo, it.id 

结果：

 
tipo item                         qt 
------ ---------------------------------------------------------------------------------------------------- ----------- 
0  Mann Co. Supply Crate Key                   6 
0  Tour of Duty Ticket                     10 
0  Reinforced Robot Emotion Detector                 5 
0  Reinforced Robot Bomb Stabilizer                  1 
0  Battle-Worn Robot Taunt Processor                 3 
0  Battle-Worn Robot KB-808                    22 
0  Battle-Worn Robot Money Furnace                  19 
1  Mann Co. Supply Crate Key                   41 
1  Tour of Duty Ticket                     31 
1  Pristine Robot Currency Digestor                  1 
1  Pristine Robot Brainstorm Bulb                  2 
1  Reinforced Robot Emotion Detector                 32 
1  Reinforced Robot Humor Supression Pump                45 
1  Reinforced Robot Bomb Stabilizer                  39 
1  Battle-Worn Robot Taunt Processor                 69 
1  Battle-Worn Robot KB-808                    78 
1  Battle-Worn Robot Money Furnace                  109 

期望的结果：

 
item          qt_1  qt_0 
------------------------------------------ ---------- -------- 
Mann Co. Supply Crate Key     41   6 
Tour of Duty Ticket       27   6 
Pristine Robot Currency Digestor   1   0 
Pristine Robot Brainstorm Bulb    2   0 
Reinforced Robot Emotion Detector   32   5 
Reinforced Robot Humor Supression Pump  45   0 
Reinforced Robot Bomb Stabilizer   39   1 
Battle-Worn Robot Taunt Processor   89   3 
Battle-Worn Robot KB-808     92   16 
Battle-Worn Robot Money Furnace    109   19 

是否有可能在一个简单的方法来做到这一点？ （不使用#temp，并插入/更新值）。使用旋转将是最适合我=）

编辑：

该解决方案是基于JanR答案。再次感谢，男士！

select it.itemname as item, 
      sum(case when res.tipo = 0 then resi.quantity else 0 end) as qt_compra, 
      sum(case when res.tipo = 1 then resi.quantity else 0 end) as qt_venda 
from Reserve as res inner join 
      ReserveItems as resi on res.id_reserve = resi.id_reserve inner join 
      Items as it on resi.defindex = it.defindex 
where res.situacao = 3 
group by it.id, it.itemname 
order by it.id 

Answer 1

不知道这是否会回答你的问题，但是我发现，您包括您GROUP BY子句中tipo，这将导致记录被分割，例如“曼恩公司补给箱钥匙”可以根据您的信息，有一个tipo为0或1。并且这将通过0 Mann Co. Supply Crate Key &分组1 Mann Co. Supply Crate Key第二组。

编辑：看你的查询，你可能想是这样的：

select 
      it.itemname as item, 
      sum(case when resi.tipo = 0 then resi.quantity else 1 end) as qty_0, 
      sum(case when resi.tipo = 1 then resi.quantity else 0 end) as qty_1 
from Reserve as res inner join 
      ReserveItems as resi on res.id_reserve = resi.id_reserve inner join 
      Items as it on resi.defindex = it.defindex 
where res.situacao = 3 
group by it.itemname 
order by tipo, it.id 

请记住，不知道这是一个有点硬:)