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Why Oracle SQL Developer does not need Oracle client?

I installed Oracle SQL Developer from Oracle's web page. It seems to work without a Oracle client installed on my computer. How is that possible? I also installed Toad for Oracle and it seems to ...
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Different dates Oracle 11g with TOAD

I have the following queries: SELECT to_date(to_char(to_date('01-FEB-1949'))) FROM DUAL; /*this returns 2/1/2049. */ SELECT to_date(to_char(to_date('01-FEB-1949'),'dd-MON-yyyy')) FROM DUAL; ...