Hi guys, I need suggestion for show from my mysql table only the first row grouped by unique tblID and to exclude all the rows with the same tblID that are within an hour compared to the previous row.

E.g.:
PHP Code:
+----------+---------------------+
tblID    theDate             |
+----------+---------------------+
77002221 2013-06-12 11:17:29 |
56009055 2013-06-12 11:17:29 |
77002221 2013-06-12 11:47:29 |
77002221 2013-06-12 12:17:29 |
77002221 2013-06-12 12:47:29 |
+----------+---------------------+ 
In this example I need show only this output:
PHP Code:
+----------+---------------------+
tblID    theDate             |
+----------+---------------------+
77002221 2013-06-12 11:17:29 |
56009055 2013-06-12 11:17:29 |
77002221 2013-06-12 12:47:29 |
+----------+---------------------+ 
Because this rows compared to the first row with tblID 77002221 fall within one hour:
PHP Code:
+----------+---------------------+
tblID    theDate             |
+----------+---------------------+
77002221 2013-06-12 11:47:29 |
77002221 2013-06-12 12:17:29 |
+----------+---------------------+ 
Can you help me?
Thank you in advance.