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SQL query help

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Last Modified: 2014-04-02
I have one table with two cols

Table1
-----------
col1                                                                  col2
-----                                                                  -----
",,"                  
(null)            
19/05/1975
27/08/1976
MK109 - Sales Training (All Staff)


What I want is to
1. update col2 with date format
2. If there is any data other than dd/mm/yyyy format (regex) make it to null

I used the below suggested

update source_trim set date_of_birth_1 = to_date(date_of_birth,'dd/mm/yyyy HH:MI AM')
where regexp_like(date_of_birth,'(0[1-9]|[12][0-9]|30|31)/(0[1-9]|1[12])/[0-9]{4}');

It updates the values for example 19/MAY/75, what i want is to append 12:00 AM as well. If its present in col1, i would use that, else I might simply append 12:00 AM.

How do i do that.
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