Trying to get the result in single row using sql?

Question

I\'m trying to display all the employee id\'s

i need the result like

emp_id

10,11,12,13,14,15..,...

when tried

Answer 1

For SQL try

 SELECT GROUP_CONCAT(emp_id) as emp_id FROM employees;

Working demo at http://sqlfiddle.com/#!2/90dd2/1

For Oracle

SELECT LISTAGG(emp_id,',') WITHIN GROUP(ORDER BY emp_id) as emp_id 
FROM   employees;

demo at http://sqlfiddle.com/#!4/af004/9