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In the given context, we have a table named 'station' which contains a column 'city'. The problem is to find out all the unique city names that end with a vowel. This is a common type of problem in data filtering where we need to apply certain conditions to extract specific information.
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The solution uses a SQL query to solve the problem. The 'select distinct' statement is used to select unique city names from the 'station' table. The 'where' clause is used to filter the cities based on the condition that the last character of the city name (obtained using 'right(city,1)') should be a vowel ('a', 'e', 'i', 'o', 'u').
select distinct city from station where right(city,1) in('a','e','i','o','u')
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