Query to get the record with latest date

I have
ACCOUNT_TABLE
account_number
account_event
event_date
ACCOUNT_TABLE
1,Open,12 Jan 2006
1,Open,13 Jan 2006
1,Open,14 Jan 2006
1,Open,15 Jan 2006
1,Open,16 Jan 2006
How can I get the latest record(16 Jan 2006) in one sql statement.
Thx
m

if you have more account_event's then...
SQL> with t as
2   (select 1 account_number,'Open' account_event,'12 Jan 2006' event_date from dual union all
3   select 1,'Open','13 Jan 2006' from dual union all
4   select 1,'Open','14 Jan 2006' from dual union all
5   select 1,'Open','15 Jan 2006' from dual union all
6   select 1,'Open','16 Jan 2006' from dual union all
7   select 1,'Close','17 Jan 2006' from dual union all
8   select 1,'Close','18 Jan 2006' from dual union all
9   select 2,'Open','19 Jan 2006' from dual)
10   select * from t a
11   where (a.account_number, account_event,a.event_date) in
12   ((select b.account_number, account_event,max(b.event_date) from t b group by b.account_number,account_event))
13 order by account_number;
ACCOUNT_NUMBER ACCOU EVENT_DATE
             1 Close 18 Jan 2006
             1 Open 16 Jan 2006
             2 Open 19 Jan 2006

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21     from dual
22   union all
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a1 b1 c1 d1          1        100
a1 b2 c1 d1          1        101
a1 b2 c2 d1          1        102
a1 b2 c2 d2          1        103
a2 b1 c1 d1          1        104
a2 b2 c1 d1          1        105
a2 b2 c2 d1          1        106
a2 b2 c2 d2          1        107
a1 b1 c1 d1          2        108
a1 b2 c2 d1          2        109
a1 b2 c2 d2          2        110
a2 b2 c1 d2          2        111
a2 b2 c2 d2          2        112
a1 b2 c2 d2          3        113
a2 b1 c1 d1          3        114
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SQL> -- from here we only need to get those with the lastest value for the col_ver
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2 (select 'a1' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver, 100 col7
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6     from dual
7   union all
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9     from dual
10   union all
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12     from dual
13   union all
14   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver, 104 col7
15     from dual
16   union all
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18     from dual
19   union all
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21     from dual
22   union all
23   select 'a2' col1, 'b2' col2, 'c2' col3, 'd2' col4, 1 col_ver, 107 col7
24     from dual
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27     from dual
28   union all
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39     from dual
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43   union all
44   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 3 col_ver, 114 col7
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48                 row_number() over (partition by t.col1, t.col2, t.col3, t.col4
49                                    order by t.col_ver desc) rn
50            from t) a
51   where a.rn = 1;
CO CO CO CO    COL_VER       COL7
a1 b1 c1 d1          2        108
a1 b2 c1 d1          1        101
a1 b2 c2 d1          2        109
a1 b2 c2 d2          3        113
a2 b1 c1 d1          3        114
a2 b2 c1 d1          1        105
a2 b2 c1 d2          2        111
a2 b2 c2 d1          1        106
a2 b2 c2 d2          2        112
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SQL>

Query to get the record with latest date

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