Checking correct data format using sql query

1) I got column date of joining which accepts date in below format
DD-MON-YYYY
DD-MON-YY
MON-DD-YYYY
MON-DD-YY
Month DD,YYYY
Question:- how do i check whether all dates in Date of joining column are in above format or not using sql query?
2) I got one more date column which accepts date in below format
MMDDYYYY
YYYYMMDD
MM/DD/YYYY
MM/DD/YY
YYYY/DD/MM
Question:- how do i check whether all dates in date column are in above format or not using sql query?
sorry if it is a very simple question since I am new to sql and trying to learn ......Thanks for the answers from the group............

In short, NO, it's not possible. If you store dates correctly in the database as DATE datatype then you don't have this problem. If you store them as VARCHAR2 you have a problem.
So, you get a date of 20092012
Is that 20th September 2012? or is it 20th December 2009?
What about...
11-Jan-12
Is that 11th January 2012 or 12th January 2011?
Dates should never be stored on the database as strings. That is why Oracle gives you a DATE datatype so you can store them properly.
Also, when dates are passed from an application to the database, the application should be passing them as DATE datatype, and the application interface should be designed to accept dates from the user in a format specific to their country/locality and it would then know what that format is and automatically convert it to a DATE datatype before it gets anywhere near the database or any SQL.

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See below:
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7499 ALLEN      SALESMAN 7698 20-FEB-81    1600     300     30
7521 WARD       SALESMAN 7698 22-FEB-81    1250     500     30
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7654 MARTIN     SALESMAN 7698 28-SEP-81    1250    1400     30
7698 BLAKE      MANAGER   7839 01-MAY-81    2850             30
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7839 KING       PRESIDENT      17-NOV-81    5000             10
7844 TURNER     SALESMAN 7698 08-SEP-81    1500       0     30
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7900 JAMES      CLERK     7698 03-DEC-81     950             30
7902 FORD       ANALYST   7566 03-DEC-81    3000             20
7934 MILLER     CLERK     7782 23-JAN-82    1300             10
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from
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Ian,
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If the client machine is set up as UK, the today function will provide the date as formatted in the second query. If the database server is setup as lets say USA, I believe that SQL Server query parser will also interpret the date as Mar 8, 2007.
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http://www.ddbcinc.com/askDDBC

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Checking correct data format using sql query

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