Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

LIKE only.
IN only.
Both IN and NOT IN.
NOT IN only.

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

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

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Introduction to SQL
NULL is

the same as blank for character
the same as 0 for integer
the same as 0 for integer and blank for character
not a value

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