how to create a new table in database I followed the document to create a migration, add a schema version, install migration and add schema codes into Install.php. Last I run the migrate up command, but no table is created. Anyone could tell me what is going wrong please?
Not sure I'm following 100%, but in Craft 3, you can add the code necessary to create the new table in your plugin's Install migration.

That will run every time someone does a fresh installation of your plugin.

For the people that already have your plugin installed, you need to create a migration that also creates the table.  The code for the table creation will be very similar in both places.

For the latter, in order for Craft to know a plugin has a new migration is wants to run, you'll need to bump your plugin's schema version number.