What does the UPPER function do in SQL?
Understand the Problem
The question is asking for the function of the UPPER function in SQL and provides multiple choice answers to select from. The task is to determine the correct option that describes what the UPPER function does.
Answer
It converts all characters in a string to uppercase.
The UPPER() function in SQL converts all characters in a string to uppercase.
Answer for screen readers
The UPPER() function in SQL converts all characters in a string to uppercase.
More Information
The UPPER() function is useful for standardizing string formats, making comparisons case-insensitive, and is especially handy when working with case-sensitive data where uniformity is needed.
Tips
A common mistake is using UPPER on a string that is already uppercased, which can lead to redundancy or unnecessary processing. Also, remember that UPPER won't change numerical or special characters, only the alphabetic ones.
Sources
- SQL Server UPPER() Function - W3Schools - w3schools.com
- SQL UPPER() Function - GeeksforGeeks - geeksforgeeks.org
- Overview of SQL LOWER and SQL UPPER functions - SQLShack - sqlshack.com
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