To calculate the number of days between 1st January 2019 and the current date (SYSDATE) in Oracle SQL, the following considerations apply:
SYSDATE is a date data type, so arithmetic operations on dates can directly calculate the difference in days.
String literals representing dates (like '01-JAN-2019') must be explicitly converted to date values using TO_DATE.
Correct Answers:
C. SELECT ROUND(SYSDATE - TO_DATE('01/JANUARY/2019')) FROM DUAL;
This query works because TO_DATE('01/JANUARY/2019') converts the string to a date, and subtracting it from SYSDATE gives the number of days. The ROUND function rounds the result to the nearest whole number.
E. SELECT SYSDATE - TO_DATE('01-JANUARY-2019') FROM DUAL;
This query also works because it correctly converts '01-JANUARY-2019' to a date and subtracts it from SYSDATE, returning the exact number of days as a decimal.
The only working query is E all of the others are not working.
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