I have two different databases. I have to access data from one database and insert them into another ( with some data processing included, it is not only to copy data ) Also, the schema is really complex and each table has many rows, so copying data into schema in the second database is not an option. I have to do that using MySQL Workbench, so I have to do it using SQL queries. Is there a way to create a connection from one database to another and access its data?
While MySQL Workbench can be used to transfer data between servers (eg as part of a migration process) it is not useful when you have to process the data first. Instead you have 2 other options:
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