You need to create a table for a banking application. One of the columns in the table has the
following requirements:
1) You want a column in the table to store the duration of the credit period.
2) The data in the column should be stored in a format such that it can be easily added and
subtracted with date data type without using conversion functions.
3) The maximum period of the credit provision in the application is 30 days.
4) The interest has to be calculated for the number of days an individual has taken a credit for.
Which data type would you use for such a column in the table?
A.
DATE
B.
NUMBER
C.
TIMESTAMP
D.
INTERVAL DAY TO SECOND
E.
INTERVAL YEAR TO MONTH
Explanation:
The Correct answer is
D. INTERVAL DAY TO SECOND
INTERVAL DAY TO SECOND stores a period of time in terms of days, hours, minutes, and seconds. This data type is useful for representing the precise difference between two datetime values.
You can perform a number of arithmetic operations on date (DATE), timestamp (TIMESTAMP, TIMESTAMP WITH TIME ZONE, and TIMESTAMP WITH LOCAL TIME ZONE) and interval (INTERVAL DAY TO SECOND and INTERVAL YEAR TO MONTH) data.
– It stores duration of the credit as days
– The format stored is numeric format, and you know that numeric values can be easily added and subtracted with date data type without using conversion functions (i.e. SELECT SYSDATE – 1 FROM DUAL;)
– The interest has to be calculated for the number of days an individual has taken a credit for, so it will be easy to calculate interest by using the interest rate and duration of the the credit which is numeric format.
Kumar
OCP