可读性太低的SQL语句

　　　　最近做开发，大多的功能都在sql上完成，用sql直接求出所需要的报表，然后DataSource一下，功能就完成了，CS开发简洁，速度也快。

　　　　但后续的发现让我头痛不已，SQL表套表套的太多了，可读性非常差，想修改一个功能，增加一个字段，或出现一个BUG，都寸步难行。

select b.仓位,cast(a.应发 as   decimal(10,   2)) as 应发,b.型号,b.仓位内码,b.物料名称,b.物料内码,a.原单单号,a.原单分录,a.原单类型,b.仓库内码,
 'SEOUT002431' as 单据号,b.日期,c.仓库数量,a.发货单分录  from (  
 select (i.FQty-i.FAuxStockQty) as 应发,FItemID as 物料内码,i.FSourceBillNo as 原单单号,i.FSourceEntryID as 原单分录,
 i.FSourceInterId as 原单内码,i.FSourceTranType as 原单类型,i.FEntryID as 发货单分录   
 from SEOutStock h  inner join SEOutStockEntry i on h.FInterID=i.FInterID where h.FBillNo='SEOUT002431'  
 ) a inner join (  
 select c.FName as 仓位,b.FModel as 型号 ,b.FName as 物料名称,a.materialID as 物料内码,  
 a.wareID as 仓位内码,a.wareHouseID as 仓库内码,(cast(y as varchar(5))+'-'+cast(m as varchar(5))) as 日期   
 from ( 
 select SUM(qty) 仓库数量,materialID,wareID,wareHouseID,YEAR(prodate) as y,MONTH(prodate) as m  
 from xt_CodeInfo group by materialID,wareHouseID,wareID,wareHouseID,YEAR(prodate), MONTH(prodate) 
  ) a left join t_ICItem b on a.materialID=b.FItemID  
  left join t_StockPlace c on a.wareID=c.FSPID   
  where  a.wareHouseID!=0 and a.materialID in   
  (select i.FItemID from SEOutStock h  inner join SEOutStockEntry i on h.FInterID=i.FInterID where h.FBillNo='SEOUT002431' ) 
   ) b on a.物料内码=b.物料内码  left join (  
   select SUM(qty) 仓库数量,materialID,wareID,wareHouseID,cast(YEAR(prodate) as varchar(10)) +'-'+ cast(MONTH(prodate) as varchar(20)) as 日期  
   from xt_CodeInfo where flag=1 group by materialID,wareHouseID,wareID,wareHouseID,YEAR(prodate), MONTH(prodate) 
    ) c on b.物料内码=c.materialID and b.日期=c.日期 and b.仓位内码=c.wareID where 应发>0  order by a.原单分录,b.日期,b.物料内码,b.仓位内码

　　　　目前网上没有找到可读性强的SQL写法，我觉得SQL还是写简单点好，虽然效率低了点，但好修改