Introduction to SQL
Which of the following is illegal?

SELECT SYSDATE - (SYSDATE + 2) FROM DUAL;
SELECT SYSDATE - (SYSDATE - 2) FROM DUAL;
SELECT SYSDATE - SYSDATE FROM DUAL;
None of these

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Introduction to SQL
Find the name of those cities with temperature and condition whose condition is either sunny or cloudy but temperature must be greater than 70oF.

SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' OR temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' OR temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' AND temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' AND temperature > 70;

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