conditional select statement in oracle

Question

I have two tables called order and public holiday as following:

Order Table:

OrderId      OrderDate
---------------------------
    1        10 Mar 2017
         


        

Answer 1

Changed the table name of order to ordero as order is a Keyword

 select ordero.orderid, ordero.orderdate, holiday.holidaydate,case when holiday.holidaydate is not null then 'Public Holiday'
 else to_char(ordero.orderdate,'Day') end "Day" 
 from ordero left outer join holiday on ordero.orderdate=holiday.holidaydate;