SQL 查询 - 贷方、借方、余额

Question

免责声明：我知道这个问题已经被问过很多次了，但我想要的只是一个替代方案。

table如下：

create table 
Account
(Name varchar(20),
 TType varchar(5),
 Amount int);

insert into Account Values
('abc' ,'c', 500),
 ('abc', 'c', 700),
 ('abc', 'd', 100),
 ('abc', 'd', 200),

('ab' ,'c', 300),
 ('ab', 'c', 700),
 ('ab', 'd', 200),
 ('ab', 'd', 200);

预期结果很简单：

 Name     Balance
 ------  -----------
ab         600
abc        900

有效的查询是：

select Name, sum(case TType when 'c' then Amount
                    when 'd' then Amount * -1 end) as balance 
from Account a1 
group by Name.

我想要的是，是否有任何查询没有 'case' 语句（如子查询或自连接）以获得相同的结果？

Answer 1

当然可以。您可以使用带有 where 子句和 union all:

的第二个查询

select name
,      sum(Amount) balance
from   Account a1
where  TType when 'c'
group
by     Name
union
all
select name
,      sum(Amount * -1) balance
from   Account a1
where  TType when 'd'
group
by     Name

或者这个，使用带有内联视图的 join：

select name
,      sum(Amount * o.mult) balance
from   Account a1
join   ( select 'c' cd
         ,      1 mult
         from   dual
         union all
         select 'd'
         ,      -1
         from   dual
       ) o
on     o.cd = a1.TType
group
by     Name

老实说，我建议使用 case...

Answer 2

使用字符的 ASCII 代码并尝试从那里开始。 'd' 为 100，'c' 为 99。未经测试的示例：

select Name, sum((ASCII(TType) - 100) * Amount * (-1))  + sum((ASCII(TType) - 99) * Amount * (-1)))) as balance from Account a1 group by Name.

我不推荐使用这种方法，但它是一种实现您想要的方法。

Answer 3

select t.Name, sum(t.cr) - sum(t.dr) as balance from (select Name, case TType when 'c' then sum(Amount) else 0 end as cr, case TType when 'd' then sum(Amount) else 0 end as dr from Account group by Name, TType) t group by t.Name;

这一定能帮到你！！

Answer 4

以下在 Microsoft SQL 服务器上为我工作。它也有 Brought Forward 余额

WITH tempDebitCredit AS (
Select 0 As Details_ID, null As Creation_Date, null As Reference_ID, 'Brought 
Forward' As Transaction_Kind, null As Amount_Debit, null As Amount_Credit, 
isNull(Sum(Amount_Debit - Amount_Credit), 0) 'diff'
From _YourTable_Name
where Account_ID = @Account_ID
And Creation_Date < @Query_Start_Date
Union All
SELECT a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind, 
a.Amount_Debit, a.Amount_Credit, a.Amount_Debit - a.Amount_Credit 'diff'
FROM _YourTable_Name a
where Account_ID = @Account_ID
And Creation_Date >= @Query_Start_Date And Creation_Date <= @Query_End_Date
)

SELECT a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind, 
a.Amount_Debit, a.Amount_Credit, SUM(b.diff) 'Balance'
FROM   tempDebitCredit a, tempDebitCredit b
WHERE b.Details_ID <= a.Details_ID
GROUP BY a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind, 
a.Amount_Debit, a.Amount_Credit
Order By a.Details_ID Desc

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