how did you import a MySQL database?

You can indeed use the Sqlserver migration assistant. But you might run into problems later on because of collation settings. I prefer to create the datamodel myself in Sqlserver. I then have total control of the type of fields I want to use to optimize the data as good as it can be. After that, I rebuilt the code in the SQL server that is present in MySQL. Use a linked server connection to MySQL to get the data into Sqlserver. TSQL and Sqlserver has more features than Mysql to improve performance. You do not want to missout on that one. It is less fun to walk with a horse and carriage on a racetrack. Cheers

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You can use the LinkedServer feature to mySQL database using the provider. Check here for further details. https://www.mssqltips.com/sqlservertip/4570/access-mysql-data-from-sql-server-via-a-linked-server/