Question

我正在为一家小型电子企业开发数据库应用程序。我需要一个SQL查询，该查询将前一天的期末余额作为当天的期初余额。我有以下数据表

Expensis

ExpenseID   Date         Expense 

1           2019-03-01   2,000
2           2019-03-02   1,000
3           2019-03-03   500

收入

IncomeID    Date        Income

1         2019-03-01    10,000
2         2019-03-02    13,000
3         2019-03-03    10,000

必需的结果

Date        Opening Balance     Income      Expense    Closing Balance

2019-03-01      0               10,000      2,000       8,000
2019-03-02      8,000           13,000      1,000       20,000  
2019-03-03      20,000          10,000      5,00        29,500

Answer 1

您可以递归使用sum聚合函数（lag的窗口分析函数不能用于sql server 2008）

with Expensis( ExpenseID, Date, Expense ) as
(
 select  1, '2019-03-01', 2000 union all
 select  2, '2019-03-02', 1000 union all
 select  3, '2019-03-03', 500            
 ), Income( IncomeID, Date, Income ) as
     (
     select  1, '2019-03-01', 10000 union all
     select  2, '2019-03-02', 13000 union all
     select  3, '2019-03-03', 10000                 
    ), t as
    (
    select i.date, 
           i.income,
           e.expense,
           sum(i.income-e.expense) over (order by i.date) as closing_balance              
      from income i
      join expensis e on e.date = i.date
     )
     select date, 
            ( closing_balance - income + expense ) as opening_balance,
            income, expense, closing_balance
       from t;

date        opening balance income  expense closing balance
----------  --------------- ------  ------- ---------------
2019-03-01  0               10000   2000    8000
2019-03-02  8000            13000   1000    20000
2019-03-03  20000           10000   500     29500

Demo

Answer 2

这是您可以做到的一种方法您必须以不同的方式评估收入和支出有收入（选择'2018-01-05'AS DT，200 AS INC，1 AS TP 全联盟选择'2018-01-06'AS DT，300 AS INC，1 AS TP 全联盟选择'2018-01-07'AS DT，400 AS INC，1 AS TP ）

, EXPENSES AS
 (
SELECT '2018-01-05' AS DT, -100 AS EXPS, 2 AS TP
UNION ALL
SELECT '2018-01-06' AS DT, -500 AS EXPS, 2 AS TP
UNION ALL
SELECT '2018-01-07' AS DT, -30 AS EXPS, 2 AS TP
)

, UN AS
(
SELECT * FROM INCOME
UNION ALL
SELECT * FROM EXPENSES
)

SELECT *, [1]+[2] AS END_BALANCE FROM UN

PIVOT
(
  SUM(INC)
  FOR TP IN ([1],[2])           
)   AS P

前一天的期末余额作为今天的期初余额

2 个答案: