INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234560', '0857654321', 'SMS', '1/JAN/2013 09:25:34', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'SMS', '1/JAN/2013 09:45:34', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'SMS', '1/JAN/2013 09:53:43', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'SMS', '1/JAN/2013 12:25:23', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'SMS', '1/JAN/2013 13:25:45', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'SMS', '1/JAN/2013 14:25:33', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'VOICE', '1/JAN/2013 09:29:32', '0:25');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0857654321', 'VOICE', '1/JAN/2013 19:25:22', '1:15');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0857654321', '0851234567', 'SMS', '1/JAN/2013 09:27:11', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0857654321', '0851234567', 'SMS', '1/JAN/2013 09:51:12', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0857654321', '0851234567', 'SMS', '1/JAN/2013 12:45:21', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0857654321', '0851234567', 'SMS', '1/JAN/2013 13:26:01', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851111222', '0851234567', 'SMS', '1/JAN/2013 09:27:02', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851111222', '0851234567', 'SMS', '1/JAN/2013 09:55:03', '0');
INSERT INTO test_data (caller, friend, call_type, start_time, duration) VALUES ('0851234567', '0851111222', 'SMS', '1/JAN/2013 09:30:04', '0');