Prepare sql for the output style

Question

I got a table, which has 3 columns, date(DATE), total_currency_value(NUMBER), currency_code(VARCHAR2). There are only 2 values allowed for currency_code :USD, EURO.
Table:
Date total_currency_value currency_code
10-11-2005 2050 USD
10-11-2005 1200 EURO
10-15-2005 1700 USD
10-15-2005 3100 EURO
Now, I wonder how the SQL be prepared to get output it in the following pattern?
Date total_currency_USD total_currency_EURO
10-11-2005 2050 1200
10-15-2005 1700 3100
Thanks for your inputs !

Answer 1

The MAX will return only the largest transaction for each currency for each day. As long a there will never be more then one record for a currency for a day, then it will work. However if there may be multiple records per day, then you need SUM not MAX.
SQL> SELECT * FROM t;
TRANS_DT  CURR        AMT
21-OCT-05 EURO        500
21-OCT-05 USD         600
21-OCT-05 USD        1500
22-OCT-05 EURO       1000
23-OCT-05 USD         700
SQL> SELECT trans_dt,
  2         MAX(DECODE(currency, 'USD', amt, NULL)) total_currency_USD,
  3         MAX(DECODE(currency, 'EURO', amt, NULL)) total_currency_EURO
  4  FROM t
  5  GROUP BY trans_dt;
TRANS_DT  TOTAL_CURRENCY_USD TOTAL_CURRENCY_EURO
21-OCT-05               1500                 500
22-OCT-05                                   1000
23-OCT-05                700
SQL> SELECT trans_dt,
  2         SUM(DECODE(currency, 'USD', amt, NULL)) total_currency_USD,
  3         SUM(DECODE(currency, 'EURO', amt, NULL)) total_currency_EURO
  4  FROM t
  5  GROUP BY trans_dt;
TRANS_DT  TOTAL_CURRENCY_USD TOTAL_CURRENCY_EURO
21-OCT-05               2100                 500
22-OCT-05                                   1000
23-OCT-05                700John