Question

我在Oracle中有以下表格

Company   Rate   Period
1A        10     sep-16
1B        20     sep-15
1C        30     oct-16
1D        40     sep-16
1A        50     oct-16
2B        50     sep-15
1C        60     oct-14

我想选择一些行并根据条件添加值。所以结果将类似于以下内容：

Company   Rate   Period    Currency
1A        50     oct-16    USD
1C        30     oct-16    AED

在上表中，我只选择公司1A，1C，其中Period =＆＃39; oct-16＆＃39;。我需要添加一个列＆＃34;货币＆＃34;对于每个公司，其中1A = USD，1C = AED

我做的是：

select company, PERIOD , Rate 
from TABLE_test 
where period='Oct-16' And Company='1A' 
    OR period='Oct-16' and Company='1C';

我成功获得了这些公司，但在货币栏中失败了。这可能使用SQL命令吗？请帮忙。

Answer 1

select company, PERIOD , Rate,
(CASE WHEN Company ='1A' THEN 'USD' WHEN Company ='1C' THEN 'AED'  END) "Currency"
from TABLE_test where...

Answer 2

是的，可以使用案例条件：

    SELECT COMPANY,RATE,PERIOD,(CASE WHEN COMPANY='1A' THEN 'USD' 
                                     WHEN COMPANY='1C' THEN 'AED' END
                                    )CURRENCY
    FROM TABLE_TEST
    WHERE PERIOD='oct-16'
    AND COMPANY IN ('1A','1C')

Answer 3

试试这个：

SELECT Company, Rate, Period, 
  CASE WHEN Company='1A' 
    THEN 'USD' 
    WHEN Company='1C' 
    THEN 'AED' 
  END as Currency
FROM TABLE_test
WHERE Period = 'oct-16'

选择行并根据条件SQL生成新列

3 个答案: