FIRST TABLE: 
==============================================
| STD_NAME | STD_NUM | SUB_A | SUB_B | SUB_C |
==============================================
| zadok    |  3006   |   45  |  67   |  --   |
| mechi    |  2917   |   67  |  89   |  45   |
| judas    |  3010   |   20  |  --   |  12   |
| temin    |  1122   |   60  |  56   |  90   |


SECOND TABLE:
student_name student_number subject_A subject_B subject_C
zadok        3006           45        67        --       
mechi        2917           67        89        45       
judas        3010           20        --        12       
temin        1122           60        56        90