Question

我对视图创建有疑问。

这是我的问题：

我需要使用视图生成报告，该视图从两个表中获取数据，例如Table_A和Table_B。

Table_A中的示例数据：

empno  empname 
----------------
1      abc       
2      xyz

表_B中的示例数据：

Empno element_name    Amount
--------------------------------
1      Basic_Salary    10000
1      Medical_bill    500
2      Basic_Salary    20000
2      Medical_bill    500

现在，我的预期结果是

输出：

Empno   Empname     Basic_Salary   Medical_bill  Total_sum
--------------------------------------------------------------------------
1       abc              10000         500         10500

2       xyz              20000         500        20500

注1：

我通过传递季度报告或月度报告等参数来生成报告。

假设这里可以说，我需要3个月的详细报告我需要总结员工的基本工资

请帮助我。

非常感谢！

Answer 1

您可以使用以下查询：

---Table data preparation
with tabl_A (empno,  empname, effective_date, elem_name )
        as 
            ( Select 1 ,     'abc',       '13-jun-2016',  'Basic_Salary' from dual
              UNION ALL
              Select 1 ,     'abc',       '13-jun-2016',  'Medical_Bill' from dual
              UNION ALL
              Select  2,      'xyz',       '5-may-2017',   'Basic_Salary' from dual
              UNION ALL
              Select  2,      'xyz',       '5-may-2017',   'Medical_Bill' from dual ),
      tabl_B ( Empno ,Basic_Salary, Medical_Bill) as
              (
                select 1,      20000,        500 from dual
                UNION ALL
                select 2 ,     50000,        500 from dual                            
              ),   
     ---Table data preparation over              
   tabl_c (empno, empname, effective_date,sal,mbill  ) as 
   ( 
   SELECT A.empno,
         A.empname,
         A.effective_date,
         b.Basic_Salary * &num_mnth AS sal,
         b.Medical_Bill * &num_mnth AS mbill
    FROM tabl_A A 
    INNER JOIN tabl_B B 
    ON a.empno = b.empno
    GROUP BY A.empno,
         A.empname,
         A.effective_date,
         b.Basic_Salary,
         b.Medical_Bill )

 SELECT c.*, (sal + mbill) AS Total_Sum
  FROM tabl_c c;

执行时，会要求输入月份作为输入，然后显示结果。

输出：

SQL> /
Enter value for num_mnth: 3
old  22:          b.Basic_Salary * &num_mnth AS sal,
new  22:          b.Basic_Salary * 3 AS sal,
Enter value for num_mnth: 3
old  23:          b.Medical_Bill * &num_mnth AS mbill
new  23:          b.Medical_Bill * 3 AS mbill

     EMPNO EMP EFFECTIVE_D        SAL      MBILL  TOTAL_SUM
---------- --- ----------- ---------- ---------- ----------
         1 abc 13-jun-2016      60000       1500      61500
         2 xyz 5-may-2017      150000       1500     151500

Answer 2

在您回复我的评论之后...我建议您更新数据模型，这样您就可以获得一份员工表和一个包含值的元素表（纯粹主义者可以更进一步，有三个表 - 员工，元素和emp_element_values）。这意味着您可以在不知道或关心元素表的情况下更新员工数据（此时更改名称将导致对tableA的多次更新，而这不是您想要的。

WITH
 emp (empno, empname) AS
  (SELECT 1,'abc' FROM dual UNION ALL
   SELECT 2, 'xyz' FROM dual
  )
,elements (empno, element_name, element_value) AS
 (SELECT 1,'Basic_Salary',20000 FROM dual UNION ALL 
  SELECT 1,'Medical_Bill',500 FROM dual UNION ALL 
  SELECT 2,'Basic_Salary',50000 FROM dual UNION ALL 
  SELECT 2,'Medical_Bill',1000 FROM dual 
 )
SELECT
 emp.empno
,emp.empname
,sal.element_value * :number_of_months       basic_salary
,med.element_value * :number_of_months         medical_bill
FROM
 emp
,elements       sal
,elements       med
WHERE 1=1
AND emp.empno = sal.empno
AND sal.element_name = 'Basic_Salary'
AND emp.empno = med.empno
AND med.element_name = 'Medical_Bill'
;

所以，在上面我没有包含effective_date，因为我不知道这是emp还是元素的属性。

使用PIVOT创建动态视图

2 个答案: