Introduction to SQL
The SQL -92 wildcards are ____ and ____ .

question mark (?); asterisk (*)
underscore(_); question mark (?)
percent sign (%); underscore (_)
asterisk (*); percent sign (%)

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Introduction to SQL
Find the names of these cities with temperature and condition whose condition is neither sunny nor cloudy

SELECT city, temperature, condition FROM weather WHERE condition NOT IN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition NOT BETWEEN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition IN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition BETWEEN ('sunny', 'cloudy');

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Introduction to SQL
NULL is

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

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