Question

我使用相同的斯科特模式。问题是这样的。使用描述性标签显示empno，sal，TA，DA，HRA，总限额，保险，TDS，Netdeductions，Netsal。

这里Ta是sal的30％，DA是sal的40％，hra是sal的50％，保险是5％sal和tds是5％sal。总配额为ta + da + hra。扣除总额为ins + tds 现在netsal是（sal + allowances-total deductions）

我试图使用声明

来实现这一点

WITH T1 AS
 (SELECT (30 / 100 * SAL) AS TA FROM EMP),
T2 AS
 (SELECT (40 / 100 * SAL) AS DA FROM EMP),
T3 AS
 (SELECT (50 / 100 * SAL) AS HRA FROM EMP)
SELECT Empno, TA, DA, HRA, (ta + da + hra)
  FROM EMP, T1, T2, T3
 group by empno;

像这样的事情。逻辑错了我能理解。

Answer 1

只需在一个查询中执行此操作：

select e.*, (ta + da + hra) as total_allowances,
       (sal + (ta + da + hra) - (ins + tds)) as net_salary
from (select empno, (sal * 30/100) as ta, (sal * 40/100) as da, 
             (sal * 50/100) as hra,
             (sal * 0.05) as ins,
             (sal * 0.05) as tds
      from emp
     ) e;

我不明白group by的含义。您没有聚合函数，并且表格名称为emp，我希望每一行都有empno的唯一值。

Answer 2

select empno,
       sal,
       .3 * sal as ta,
       .4 * sal as da,
       .5 * sal as hra,
       .05 * sal as insurance,
       .05 * sal as tds,
       (.3 * sal) + (.4 * sal) + (.5 * sal) as total_allowances,
       (.05 * sal) + (.05 * sal) as total_deductions,
       sal + ((.3 * sal) + (.4 * sal) + (.5 * sal)) - ((.05 * sal) + (.05 * sal)) as netsal
  from emp

我不知道您正在尝试实现WITH子句。您的t1 / t2查询分别在整个表中执行每个计算。您可以在同一查询中执行每个计算。并且似乎不涉及任何多个表，因此您不需要任何连接。

带有子查询的Oracle Sql

2 个答案: