How to add a post after / before row in database

i have already some posts in database table but i want to add a new record after or before a existing row. i can’t have (int) column and i don’t want (int) column.
i have table like:

-------------------------------
|  Date  |  Time  | Person_No |
-------------------------------
|07-06-15|  09:30 |     12    |  // i want to add a new record after this row, like time: 10:00 
-------------------------------
|07-06-15|  10:30 |     12    |
-------------------------------
|07-06-15|  11:00 |     12    |
-------------------------------

please tell me how is possible to add a new record after Date: 07-06-15 time : 09:30 p_no : 12
…..


Source: mysql

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