What does the CONCAT function do in MySQL?
Can CONCAT handle NULL values? What happens if one of the strings is NULL?
Provide an example of using CONCAT with literals and column names.
How can you use CONCAT to generate a dynamically formatted date string from separate year, month, and day columns?
What is the difference between CONCAT and CONCAT_WS? Provide an example where CONCAT_WS is preferable.
Explain how you can concatenate a list of emails with semicolons between them using CONCAT and other string functions.
Discuss the performance implications of using CONCAT in large text fields within a MySQL database.
How can you use CONCAT in a JOIN operation to create a unique identifier for a record across two tables?
How does the CONCAT function handle different character encodings in MySQL?
A potential certification exam question could be: "Given a table with columns for first name, last name, and email, write a query using CONCAT to create a single string for each row formatted as 'LastName, FirstName <Email>'. Explain any considerations you must make regarding NULL values."