How to select values frm table giving the condition value at runtime in SQL

Question

Hi All,
How to select values from a table by giving the condition value at runtime in SQL
My SQL statement is select * from employee where empno=<empno>, this empno I want to provide at run time. Also I don't have any bind variables defined. Can anyone please tell how can I achieve this. Also do I have to write a SQL or pl/sql statement.

Answer 1

Hi Roshni Shankar,
You can use substitution variable in case of SQL.
SQL> select * from employees where emplployee_id = &emp_id;
Enter value for emp_id: 100
old   1: select * from employees where emplployee_id = &emp_id
new   1: select * from employees where emplployee_id = 100If you want to put condition on varchar values then eighter provide values in single quotes or use single quote for substitution variable.
SQL> select * from employees where last_name = &emp_name;
Enter value for emp_name: 'King'
old   1: select * from employees where last_name = &emp_name
new   1: select * from employees where last_name = 'King'
no rows selected
SQL> select * from employees where last_name = '&e_name';
Enter value for e_name: King
old   1: select * from employees where last_name = '&e_name'
new   1: select * from employees where last_name = 'King'In case of pl/sql you can pass values to procedure and you can use those values at run time.
create or replace procedure test (p_emp_id number)
as
   v_last_name      varchar2(100);
begin
   select last_name
   into    v_last_name
   from  employees
   where employee_id = p_emp_id;
   dbms_output.put_line(p_emp_id ||'    ->    '||v_last_name);
end;
show errors
SQL>exec test(100);
SQL>exec test(101);Edited by: Gaurav Bhide on Oct 29, 2012 4:07 AM