0

我有一个看起来像这样的表：

+--------------+------------+-------------+
| TaxAuthority | Effective  | AuthTaxRate |
+--------------+------------+-------------+
| city1        | 1993-01-01 |         1.0 |
| city1        | 1994-01-01 |         1.5 |
| city2        | 1993-09-01 |         1.5 |
| city2        | 1994-01-01 |         2.0 |
| city2        | 1995-01-01 |         2.5 |
| city3        | 1993-01-01 |         1.9 |
| city3        | 1993-07-01 |         2.3 |
| county1      | 1993-01-01 |         2.3 |
| county1      | 1994-10-01 |         2.5 |
| county1      | 1995-01-01 |         2.7 |
| county2      | 1993-01-01 |         2.4 |
| county2      | 1994-01-01 |         2.7 |
| county2      | 1995-01-01 |         2.8 |
| state1       | 1993-01-01 |         0.5 |
| state1       | 1994-01-01 |         0.8 |
| state1       | 1994-07-01 |         0.9 |
| state1       | 1994-10-01 |         1.1 |
+--------------+------------+-------------+

我正在尝试选择 1994 年 11 月 1 日 city2 的税率。示例：

City2 = 2.0
County1=2.5
State1=1.1
Total=5.6

到目前为止，我已经能够得到加起来为 5.6 的所有金额；但是，我不知道如何将 3 个总和相加。这是我到目前为止的声明：

    select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'City2' 
    and Effective <= '1994-11-01' 
    and Effective > '1993-09-01' 
    union 
    select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'County1' 
    and Effective <= '1994-11-01' 
    and Effective > '1993-09-01' 
    union 
    select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'State1' 
    and Effective <= '1994-11-01' 
    and Effective > '1994-07-01';

我的陈述结果是：

+-------------+
| AuthTaxRate |
+-------------+
|         2.0 |
|         2.5 |
|         1.1 |
+-------------+

有谁知道如何将这些值相加？

4

1 回答 1

0

我现在确定，但你可以这样尝试-

Select sum( 
 select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'City2' 
    and Effective <= '1994-11-01' 
    and Effective > '1993-09-01' 
    union 
    select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'County1' 
    and Effective <= '1994-11-01' 
    and Effective > '1993-09-01' 
    union 
    select AuthTaxRate 
    from TaxRates 
    where TaxAuthority = 'State1' 
    and Effective <= '1994-11-01' 
    and Effective > '1994-07-01';
 ) As  total;
于 2013-11-10T02:06:29.537 回答