Introduction to SQL
Which of the following is illegal?

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

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Introduction to SQL
Find the temperature in increasing order of all cities

SELECT city, temperature FROM weather ORDER BY temperature;
SELECT city, temperature FROM weather ORDER BY city;
SELECT city FROM weather ORDER BY temperature;
SELECT city, temperature FROM weather;

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