DECODE is equivalent to a map function in sql, which will create a new column to display the value
SELECT T1.*,
T2.WAREKIND_NAME,
DECODE(T1.CURRENCY_TYPE, 'A', '111', 'B', '222') CURRENCY_NAME
FROM TB_CUS_TRADE_WARE T1, TB_BAS_BED_SRT T2
WHERE T1.WAREKIND_KEY = T2.WAREKIND_KEY AND
/*T1.CUS_USER_KEY = :CUS_USER_KEY AND*/
T1.CURRENCY_TYPE = 'A'
ORDER BY T2.ORDER_NUM ASC