Q

Query to view all emp_id in a single column

I have a table with employee name as emp_id column. I want a result of all emp_id in a single column as comma separated. In SQL Server (T-SQL), the following query gives the correct result.
DECLARE @EmployeeList varchar(5000)
SELECT @EmployeeList = COALESCE(@EmployeeList + ', ', '') + 
   CAST(ltrim(rtrim(emp_id )) AS varchar(20))
FROM employee
SELECT @EmployeeList

I need results in Oracle with PL/SQL as well.
Here you go:

DECLARE
 result_set varchar2(4000);
 cursor c1 is select emd_id from employee;
BEGIN
   FOR c1rec in c1 LOOP
    result_set := result_set || ',' || c1rec.emp_id;
  END LOOP;
   dbms_output.put_line(ltrim(result_set, ','));
END;

This was first published in March 2004

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