carts table:
S.No | username | orderid             | exam_name | order_date         |
1    | Rakesh   |746G797W819d3343493z | PMP       | 2016-11-05 11:34:5 |
2    | Kulkarni |24890W819d6743493W   | CAPM      | 2016-11-05 11:34:5 |
3    | Suresh   |52890W819d6743493W   | PMP       | 2016-11-05 11:34:5 |
4    | Gautham  |90890W819d6743493W   | PMP       | 2016-11-05 11:34:5 |

checks table:
S.No | username | orderid             | exam_name | checked_date         
1    | Rakesh   |746G797W819d3343493z | PMP       | 2016-11-07 11:20:5   
2    | Kulkarni |24890W819d6743493W   | CAPM      | 2016-11-07 11:20:5
	
S.No | username | orderid             | exam_name | order_date         |
1    | Suresh   |52890W819d6743493W   | PMP       | 2016-11-05 11:34:5 |
2    | Gautham  |90890W819d6743493W   | PMP       | 2016-11-05 11:34:5 |