Weather Observation Station 8

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    select distinct city from station where city regexp '^[aeiou]' AND city regexp '[aeiou]$'

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    select city from station where city like 'a%a' or city like 'e%e' or city like 'i%i' or city like 'o%o' or city like 'u%u'

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    SELECT DISTINCT CITY FROM STATION WHERE (CITY LIKE 'A%'OR CITY LIKE 'E%'OR CITY LIKE 'I%'OR CITY LIKE 'O%'OR CITY LIKE 'U%')AND (CITY LIKE '%A' OR CITY LIKE '%E' OR CITY LIKE '%I' OR CITY LIKE '%O'OR CITY LIKE '%U') ;

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    Correct

    SELECT DISTINCT city FROM station WHERE (LOWER(city) LIKE 'a%' OR LOWER(city) LIKE 'e%' OR LOWER(city) LIKE 'i%' OR LOWER(city) LIKE 'o%' OR LOWER(city) LIKE 'u%') AND (LOWER(city) LIKE '%a' OR LOWER(city) LIKE '%e' OR LOWER(city) LIKE '%i' OR LOWER(city) LIKE '%o' OR LOWER(city) LIKE '%u');

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    SELECT DISTINCT CITY FROM STATION WHERE SUBSTR(CITY,1,1) IN ("a","e","i", "o","u") AND SUBSTR(CITY,-1,1) IN ("a","e","i", "o","u");