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In the given context, we have a table named 'station' with a column 'city'. The problem is to find out all the distinct city names that do not start or end with a vowel. The vowels considered here are 'a', 'e', 'i', 'o', 'u'.
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The solution approach uses the SQL 'select distinct' statement to get unique city names. It then uses the 'where' clause to filter out cities that do not meet the criteria. The 'left' and 'right' functions are used to get the first and last character of the city name respectively. The 'not in' operator is used to check if these characters are not in the set of vowels.
select distinct city from station where left(city,1) not in('a','e','i','o','u') or right(city,1) not in('a','e','i','o','u');
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