Weather Observation Station 9

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    uses the REGEXP operator to filter out cities that do not start with a vowel. Here's a professional breakdown of how it works:

    The caret (^) at the beginning of the pattern ensures the match occurs at the start of the string. The bracketed expression [^aeiou] matches any character except the vowels (a, e, i, o, u). Together, ^[^aeiou] ensures that only cities beginning with consonants are selected. This method is more efficient than explicitly listing all consonants ([bcdfghjklmnpqrstvwxyz]).

    If you're looking for ways to optimize time management in database queries or everyday tasks, you can find useful tools like the Calculadora Turnos Noturnos to streamline calculations efficiently.

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    Oracle SQL: SELECT DISTINCT CITY FROM STATION WHERE NOT REGEXP_LIKE(CITY,'^[AEIOU]','i');

    MYSQL: SELECT DISTINCT CITY FROM STATION WHERE LEFT(CITY,1) not in ('a','e','i','o','u');

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