String Functions — Solution & ExplanationProblems / String Functions / EditorialApproachSQL provides built-in string functions for text manipulation.

UPPER(username) converts every character to uppercase.

LOWER(email) normalizes the email to lowercase.

LENGTH(username) counts the number of characters.

These functions are essential for data cleaning and standardization.Hints

UPPER() converts a string to all uppercase letters.

LOWER() converts a string to all lowercase letters.

LENGTH() returns the number of characters in a string.