在 SAS 中使用 PROC SQL 查询财务余额？

Question

我有两张表，先叫它“事务”

transaction_id	transaction_type	amount
101	1	50.00
102	2	25.00
103	3	35.00
104	2	15.00
105	1	60.00

第二个称它为“transaction_types”

id	description
1	Deposit
2	Retirement
3	Inner_transaction

“transaction_types”表中的“id”列，对应第一个表中的“transsaction_id”

假设初始余额为 100,000.00 美元。我应该写一个查询来获取历史账户余额。我应该展示的表格是这样的：

transaction_id	initial_balance	deposit	withdrawal	final_balance
101	100000	50.00		100050
102	100050		25.00	100025
103	100025			100025
...	...	...	...	...

我使用 PROC SQL 在 SAS 中编写此代码：

TITLE "Balance Historico de la Wallet Empresarial";
PROC SQL;
    SELECT transaction_id,
           100000 AS initial_balance FORMAT=DOLLAR32.2,
           "" AS deposit,
           "" AS withdrawal,
           "" AS final_balance
    FROM _LIB.TRANSACTIONS;
QUIT;

但我不知道如何填充其他列。

Answer 1

考虑条件聚合，您可以有条件地分配新列，然后按所需的分组进行聚合。使用calculated 子句完成所需的最终余额算术。

TITLE "Balance Historico de la Wallet Empresarial"; 

PROC SQL; 
   SELECT transaction_id
        , initial_balance FORMAT=DOLLAR32.2
        , SUM(deposit) AS deposit FORMAT=DOLLAR32.2
        , SUM(withdrawal) AS withdrawal FORMAT=DOLLAR32.2
        , initial_balance + 
          calculated deposit - 
          calculated withdrawal AS final_balance FORMAT=DOLLAR32.2
  FROM 
   (SELECT ts.transaction_id
         , 100000 AS initial_balance
         , CASE WHEN tt.description = 'Deposit' THEN ts.amount ELSE NULL END AS deposit
         , CASE WHEN tt.description = 'Withdrawal' THEN ts.amount ELSE NULL END AS withdrawal
         , CASE WHEN tt.description = 'Inner_balance' THEN ts.amount ELSE NULL END AS inner_balance
    FROM _LIB.TRANSACTIONS ts
    INNER JOIN _LIB.TRANSACTION_TYPES tt
       ON ts.transaction_type = tt.id
   ) sub
  GROUP BY transaction_id
         , initial_balance;
QUIT; 

或者，对于 SAS SQL 方言，使用 IFN 以获得略短的语法：

  ...
  , IFN(tt.description = 'Deposit', ts.amount, .) AS deposit
  , IFN(tt.description = 'Withdrawal', ts.amount, .) AS withdrawal
  , IFN(tt.description = 'Inner_balance', ts.amount, .) AS inner_balance
  ...