How do you use a comma correctly? This article provides some useful tips for using semicolons (;), colons (:), commas (,) and dashes (—). If you’re unsure about punctuation, a punctuation checker can help clarify whether you’re using commas, colons, or semicolons correctly.
Semicolons (;) separate independent clauses that are related in meaning, and they separate items in a list when those items themselves are long or include commas. For example, this summary could say "Semicolons are useful; they show that clauses are related in meaning."
A USE database statement is not allowed in a procedure, function or trigger. I have thought of creating a function as an alternative approach, but I would like to know how can I use STRING_SPLIT in a stored procedure?
How to use function from Master in SQL Server in stored procedure
When to Use a Semicolon vs Colon, Comma, and Em Dash (; : , —)
You can use a colon to draw attention to many things in your writing. The categories listed below often overlap, so don’t worry too much about whether your intended use of the colon fits one category perfectly.
If no default database is assigned to the login, its default database is set to master. USE is executed at both compile and execution time and takes effect immediately.
USE master; isn't always necessary, but sometimes it is, and it doesn't hurt to always execute server-level commands from that database. I believe it's not a requirement that you should use the master database to create a database.