I want to display a default message when there is no data obtained from a query.
For example Let us take a query
select empname from employee where id = 100
If no data matches this search i want to get Unavailable
as a result or the required result should display.
So how should i write a SQL query to achieve this.
I am using Oracle 10g.
SELECT COALESCE((SELECT empname FROM employee WHERE id = 100), 'Unavailable')
FROM DUAL;
You have to wrap the SELECT
into another SELECT
or no row will be returned. And where there is no row, there cannot be a value.