Introduction to SQL
NULL is

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

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Introduction to SQL
Find the name of cities with all entries whose temperature is in the range of 71 and 89

SELECT * FROM weather WHERE temperature NOT IN (71 and 89);
SELECT * FROM weather WHERE temperature NOT BETWEEN 71 to 89;
SELECT * FROM weather WHERE temperature NOT IN (71 to 89);
SELECT * FROM weather WHERE temperature BETWEEN 71 AND 89;

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