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Following are the various approaches to solve the problem:
Approach - 1 (REGEXP)
SELECT DISTINCT CITY
FROM STATION
WHERE CITY REGEXP '^[aeiou]' AND CITY REGEXP '[aeiou]$'
Approach - 2 (SUBSTRING)
Method 1:
SELECT DISTINCT CITY
FROM STATION
WHERE SUBSTRING(CITY, 1, 1) IN ('a', 'e', 'i', 'o', 'u') AND SUBSTRING(CITY, -1, 1) IN ('a', 'e', 'i', 'o', 'u')
Method 2:
SELECT DISTINCT CITY
FROM STATION
WHERE SUBSTRING(CITY, 1, 1) IN ('a', 'e', 'i', 'o', 'u') AND SUBSTRING(CITY, LENGTH(CITY), 1) IN ('a', 'e', 'i', 'o', 'u')
Approach - 3 (LEFT & RIGHT FUNCTION)
SELECT DISTINCT CITY
FROM STATION
WHERE LEFT(CITY, 1) IN ('a', 'e', 'i', 'o', 'u') AND RIGHT(CITY, 1) IN ('a', 'e', 'i', 'o', 'u')
Approach - 4 (LIKE OPERATOR)
SELECT DISTINCT CITY
FROM STATION
WHERE
(CITY LIKE 'a%' OR CITY LIKE 'e%' OR CITY LIKE 'i%' OR CITY LIKE 'o%' OR CITY LIKE 'u%')
AND
(CITY LIKE '%a' OR CITY LIKE '%e' OR CITY LIKE '%i' OR CITY LIKE '%o' OR CITY LIKE '%u');
P.S. All above operators (IN, LIKE, REGEXP) used are case insensitive, so no need to write 'a' and 'A', simply 'a' will do the work for both the cases
Upvote if it helped :)
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Weather Observation Station 8
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Following are the various approaches to solve the problem:
Approach - 1 (REGEXP)
SELECT DISTINCT CITY FROM STATION WHERE CITY REGEXP '^[aeiou]' AND CITY REGEXP '[aeiou]$'
Approach - 2 (SUBSTRING)
Method 1: SELECT DISTINCT CITY FROM STATION WHERE SUBSTRING(CITY, 1, 1) IN ('a', 'e', 'i', 'o', 'u') AND SUBSTRING(CITY, -1, 1) IN ('a', 'e', 'i', 'o', 'u')
Method 2: SELECT DISTINCT CITY FROM STATION WHERE SUBSTRING(CITY, 1, 1) IN ('a', 'e', 'i', 'o', 'u') AND SUBSTRING(CITY, LENGTH(CITY), 1) IN ('a', 'e', 'i', 'o', 'u')
Approach - 3 (LEFT & RIGHT FUNCTION)
SELECT DISTINCT CITY FROM STATION WHERE LEFT(CITY, 1) IN ('a', 'e', 'i', 'o', 'u') AND RIGHT(CITY, 1) IN ('a', 'e', 'i', 'o', 'u')
Approach - 4 (LIKE OPERATOR)
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');
P.S. All above operators (IN, LIKE, REGEXP) used are case insensitive, so no need to write 'a' and 'A', simply 'a' will do the work for both the cases
Upvote if it helped :)