Sorted:

What is the usage of Java enums?

Check the status of Oracle database in Linux.

How to resolve the issue of the password not taking effect in Redis?

What is the usage of to_char in Oracle?

How do you create a new database in Oracle?

How can a double variable be defined in Java?

What are the different types of constant variables and functions in Java?

Importing Excel into an Oracle database.

How to connect to a MySQL database with idea?

How do I check the character set of an Oracle database?