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WITH CTE AS(
SELECT
CASE WHEN SUBSTRING(LOWER(CITY), LEN(CITY),1) IN ( 'a', 'e', 'i', 'o','u')
THEN CITY
ELSE NULL
END AS CITY
FROM STATION
)
SELECT
DISTINCT(CITY)
FROM CTE
WHERE CITY IS NOT NULL
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WITH CTE AS( SELECT CASE WHEN SUBSTRING(LOWER(CITY), LEN(CITY),1) IN ( 'a', 'e', 'i', 'o','u') THEN CITY ELSE NULL END AS CITY FROM STATION ) SELECT DISTINCT(CITY) FROM CTE WHERE CITY IS NOT NULL