在 SQL/finding 余额中执行减法

Question

SQL table 这里：http://sqlfiddle.com/#!9/abe1da/9

当前 Table:

Year	Month	Type	Accounts	Amount
2021	1	Actual	abc	20
2021	1	Actual	def	30
2021	1	Actual	ghi	40
2021	1	Actual	X	7
2021	1	Actual	Y	3
2021	1	Actual	final	105

预计

Year	Month	Type	Accounts	Amount
2021	1	Actual	abc	20
2021	1	Actual	def	30
2021	1	Actual	ghi	40
2021	1	Actual	X	7
2021	1	Actual	Y	3
2021	1	Actual	final	105
2021	1	Actual	BALANCE	5

SQL 尝试

select year, month, type,
case when accounts in ('abc') then 'abc'
 when accounts in ('def') then 'def'
 when accounts in ('ghi') then 'ghi'
 when accounts in ('X') then 'x'
 when accounts in ('Y') then 'Y'
 when accounts in ('final') then 'final'
else 'balance'
end as account_2
,
sum
(
(case when accounts in ('abc','def','ghi','final','x','y') then amount
else 
(
(case when accounts in ('final') then (amount))-
(case when accounts in ('abc','def','ghi','x','y') then -amount else 0))
)
from new

注意：余额 5 表示当前不构成数据库一部分的数千个小帐户。

Answer 1

如果我理解正确的话：

select Year, Month, Type, Accounts, Amount
from new
union all
select year, month, type, 'balance',
       (sum(case when accounts = 'final' then amount else 0 end) -
        sum(case when accounts <> 'final' then amount else 0 end) 
       )
from new
group by year, month, type;

Here 是一个 db<>fiddle.

在 SQL/finding 余额中执行减法

Performing subtraction in SQL/finding the balance

sql

tsql

sql-server

subtraction