Appending And Deleting Entries In Table

I have a question on appending and deleting entries in mysql table. This is my sample table.

table name: details

id_name | model | mode | media| first | end | id | level |
+--------------------+-------+---------+-----+-------+-------+--------+--------+
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 14684 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 14838 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15236 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15423 | 6255 | q |
| PSK_30s1207681L002 | 1 | 1 | N | 14026 | 15627 | 6255 | q |

[Code] ....

I have numerous entries of same id name belonging to same median number.However,I want to only retain the entries having the longest first and end position and discard the remaining entries

E.g. for id name ="PSK_30s1207681L002" AND median = 5 we have four entries

id_name | model | mode | media| first | end | id | level |
+--------------------+-------+---------+-----+-------+-------+--------+--------+
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 14684 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 14838 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15236 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15423 | 6255 | q |
| PSK_30s1207681L002 | 1 | 1 | N | 14026 | 15627 | 6255 | q |

But I want to retain only the one having longest first and end points ie

| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15423 | 6255 | q |
| PSK_30s1207681L002 | 1 | 1 | N | 14026 | 15627 | 6255 | q |

Here ,since for id name ="PSK_30s1207681L002" & median = N we have only 1 entry I want retain that one.

My final output in mysql table should look like this.

id_name | model | mode | media| first | last | id | level |
| PSK_30s1207681L002 | -1 | 1 | 5 | 14026 | 15423 | 6255 | q |
| PSK_30s1207681L002 | 1 | 1 | N | 14026 | 15627 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | 3 | 14033 | 15627 | 6255 | q |
| PSK_30s1207681L002 | -1 | 1 | T0 | 15550 | 16050 | 6255 | q |
| PSK_30s1189731L001 | -1 | 1 | 3 | 999 | 7531 | 9808 | c |
| PSK_30s1189731L001 | -1 | 1 | 5 | 6609 | 8257 | 9808 | c |

[Code] ....

Is there anything that I could do to append it?