The behavior of data insertion into a table with a specific numeric format in Oracle Database 12c can be explained as follows:
A. INSERT INTO rate_list VALUES (-.9) inserts the value as -.9: This is correct. The value -.9 is within the precision defined by the table column (NUMBER(6,2)), where 6 is the total number of digits (including both sides of the decimal point), and 2 is the number of digits after the decimal point.
E. INSERT INTO rate_list VALUES (0.551) inserts the value as .55: Oracle rounds the number to the nearest value that fits the specified scale of 2. Thus, 0.551 rounds down to 0.55.
References:
Oracle Database SQL Language Reference 12c, particularly sections on data types and numeric precision.
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