Which of the following is illegal?(a) SELECT SYSDATE – SYSDATE FROM DUAL;(b) SELECT SYSDATE – (SYSDATE – 2) FROM DUAL;(c) SELECT SYSDATE – (SYSDATE + 2) FROM DUAL;(d) None of the MentionedThe question was asked in my homework.The above asked question is from Structured Query Language in section SQL Basics of Oracle

Which of the following is illegal?(a) SELECT SYSDATE – SYSDATE FROM

1.	Which of the following is illegal?(a) SELECT SYSDATE – SYSDATE FROM DUAL;(b) SELECT SYSDATE – (SYSDATE – 2) FROM DUAL;(c) SELECT SYSDATE – (SYSDATE + 2) FROM DUAL;(d) None of the MentionedThe question was asked in my homework.The above asked question is from Structured Query Language in section SQL Basics of Oracle
Answer» <html><body><p>Right answer is (d) None of the Mentioned<br/><br/>The <a href="https://interviewquestions.tuteehub.com/tag/best-390038" style="font-weight:bold;" target="_blank" title="Click to know more about BEST">BEST</a> explanation: SELECT SYSDATE – SYSDATE FROM DUAL; outputs <a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a> SELECT SYSDATE – (SYSDATE – <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>) FROM DUAL; outputs 2<br/><br/>SELECT SYSDATE – (SYSDATE + 2) FROM DUAL; outputs -2.</p></body></html>

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