Answer Posted / fahad

&-it is used in run time.it ask d value as new and old value
&&-it repeats the duplicacy and it repeat d same output..
ex.single ampersent...
select employee_id,last_name,hire_date,salary from employees
where department_id=&department_id;
when u enter dis statement.
in output it vil ask d value..
enter value for department_id=



query for &&..
select employee_id,last_name,hire_date,salary from employees
where department_id=&&department_id;

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