Using Decode or some other function

Question

Hello,
I have two tables.
Table 1 is the data table where i have the following fields
Time Field the values are Jan, Feb....Dec
Data1 field has a data in USD
Data2 field has a data in Local Currency
Table 2 is Currency Convertion table The fields in this table are as follows:
Jan is a field
Feb is a field
My query should be
Table1 From Time field value Jan and Data1 * Table2 and Field Jan
What is the best statement that i can use to get the results.
Thanks in Advance!

Answer 1

You mean something like:
SQL> With Table1 as (select 'Jan' as Mn, 10000 as data1, 1200 as data2 from dual union all
  2                  select 'Feb', 13000, 1500 from dual)
  3      ,Table2 as (select 1.75 as Jan
  4                       , 1.80 as Feb
  5                       , 1.70 as Mar
  6                       , 1.65 as Apr
  7                       , 1.72 as May
  8                       , 1.77 as Jun from dual)
  9  -- END OF TEST DATA
10  SELECT t1.Mn, t1.data1, t1.data2,
11         t1.data1 * CASE t1.Mn
12                      WHEN 'Jan' Then t2.Jan
13                      WHEN 'Feb' Then t2.Feb
14                      WHEN 'Mar' Then t2.Mar
15                      WHEN 'Apr' Then t2.Apr
16                      WHEN 'May' Then t2.May
17                      WHEN 'Jun' Then t2.Jun
18                    ELSE 1
19                    END as conversion
20  FROM Table1 t1, Table2 t2
21  /
MN       DATA1      DATA2 CONVERSION
Jan      10000       1200      17500
Feb      13000       1500      23400
SQL>