TO YMINTERVAL
From Oracle FAQ
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The TO_YMINTERVAL function converts a string in format 'Y[Y...]-M[M]' into an INTERVAL YEAR TO MONTH datatype.
The first part Y[Y...] contains 1 to 9 figures indicating the number of years from 0 to 999999999. The second part M[M] contains 1 or 2 figures indicating the number of months between 0 and 11.
SQL> select TO_YMINTERVAL('01-02') from dual;
TO_YMINTERVAL('01-02')
---------------------------------------------
+000000001-02
