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DAY function
The DAY function returns the day part of a value.
The argument must be a date, timestamp, or a valid character
string representation of a date or timestamp that is not a CLOB, LONG VARCHAR,
or XML value. The result of the function is an integer between 1 and 31.
If the argument can be null, the result can be null; if the argument is null,
the result is the null value.
Syntax DAY ( expression )
Example values day('2007-08-02');
The
resulting value is 2.
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