小编sne*_*eha的帖子

我有三个表tblinventory,tbldisbursement,tblmissinglost.我想在扣除当天的支出和退货后计算账面总存量.

select bn.No_of_books_procured 
     - (count(mis.Unr_ret_donated_discareded))
     - (count(case when dis.dis_disbursed_return = 1 
                   then dis.dis_disbursed_return end ) )as Stock 
  from tbl_inventorylibbooks bn 
 right 
  join tbl_limgt_booksmissing_lost_adjust mis 
    on mis.Book_Name_missingbk = bn.Id_inventory
  left 
  join tbllibmange_disbursement dis 
    on dis.dis_book_name_fk_id = bn.Id_inventory
 where bn.Id_inventory = 14

在少数条目中,我得到正确答案,而其他结果条目查询显示错误答案.你能为此提供一个解决方案吗？

tblinventory

id  Name
----------   
1   xyz

考虑采购的总书数= 10

tbldisbursement

**booknameFK  disbursed/returned**
---------------------------------------- 
Booknafk1                 1
Booknafk2                 0 
Booknafk3                 1

其中1 =已支付,0 =已退回

tblmissinglost

**id BooknameFk  missng**
---------------------------------------- 
1    Booknafk1    lost
2    Booknafk1    lost 

---------------------------------------- 

同时检查此查询

select (bn.No_of_books_procured) as procured,
    count(distinct …