Question

我想创建一个视图（总贷款金额 - 总存款金额）使用表 loan_b 和 deposit_b 怎么可能？
使用loan_b表创建另一个视图，每个贷款的父母（20％）。表格如下：

以下是我用于表格的查询：

CREATE TABLE loan_b( cust_id VARCHAR2(10), loan_id VARCHAR2(10), loan_amount NUMBER(10) ); 

INSERT INTO loan_b VALUES(100,'100A',28500);

INSERT INTO loan_b VALUES(102,'100B',2500);

CREATE TABLE deposit_b( cust_id VARCHAR2(10), deposit_amount NUMBER(10) ); 

INSERT INTO deposit_b VALUES(99,51700); 

INSERT INTO deposit_b VALUES(99,2462);

INSERT INTO deposit_b VALUES(55,55200);

Answer 1

您可以轻松地创建一个视图作为选择，然后一旦您确定了您需要的选择，您可以创建您查看，例如：

create view your_view_name as 
select 
   a.cust_id cust_id
 , a.loan_id load_id
 , a.loan_amount loan_amount
 , b.deposit_amount deposit_amount
from loan_b a
inner join deposit_b on a.cust_id = b.cust_id;

或者如果您只需要总和

create view your_view_name2 as 
select 
   sum(a.loan_amount) sum_loan_amount
 , sum(b.deposit_amount)  sum_deposit_amount
from loan_b a
inner join deposit_b on a.cust_id = b.cust_id;

和diff你应该使用（我已经用原始表名更改了表别名）

create view your_view_name3 as 
select 
   loan_b.loan_amount - deposit_b.deposit_amount   diff_load_deposit_amount
from loan_b 
inner join deposit_b on loan_b.cust_id = deposit_b.cust_id;

使用两个表创建视图

1 个答案: