Please explain me this SQL statement
I have this select statement but I don't know what it is doing please help me understand 
I know tell u follow

 1. OBZXQ is Database 
 2. OBS_EVENT_FACT is table 
 3. EVENTNAME is column in OBS_EVENT_FACT
 4. I don't see absent_count as a column in OBS_EVENT_FACT

Thanks<br>

    select absent_count from (select count(e.EVENTNAME) as ABSENT_COUNT
    from OBZXQ.OBS_EVENT_FACT e
    where To_Date(to_char(e.STARTDATETIME, 'DD-MON-YYYY')) = To_Date('3/17/2011','MM/DD/YYYY'))
Please explain me this SQL statement
===

I have this select statement but I don't know what it is doing please help me understand 
I know tell u follow

 1. OBZXQ is Database 
 2. OBS_EVENT_FACT is table 
 3. EVENTNAME is column in OBS_EVENT_FACT
 4. I don't see absent_count as a column in OBS_EVENT_FACT

Thanks<br>

    select absent_count from (select count(e.EVENTNAME) as ABSENT_COUNT
    from OBZXQ.OBS_EVENT_FACT e
    where To_Date(to_char(e.STARTDATETIME, 'DD-MON-YYYY')) = To_Date('3/17/2011','MM/DD/YYYY'))