mysql federated

In MySQL, the FEDERATED storage engine allows you to access data from a remote MySQL server as if it were a local table. This can be useful in situations where you need to access data from multiple databases or servers without having to manually copy the data over.

To create a FEDERATED table in MySQL, you first need to have a remote server with a table that you want to access. Then, on your local server, you can create a new table with the same structure as the remote table, but with the FEDERATED storage engine specified.

Here is an example of how to create a FEDERATED table in MySQL:

CREATE TABLE federated_table (
  id INT(11) NOT NULL AUTO_INCREMENT,
  name VARCHAR(50) NOT NULL,
  email VARCHAR(50) NOT NULL,
  PRIMARY KEY (id)
)
ENGINE=FEDERATED
DEFAULT CHARSET=utf8mb4
CONNECTION='mysql://remote_user:remote_password@remote_host:remote_port/remote_database/remote_table';

In this example, `federated_table` is the name of the local table you are creating. The columns `id`, `name`, and `email` have the same structure as the remote table. The `ENGINE` parameter specifies that the FEDERATED storage engine should be used. The `DEFAULT CHARSET` parameter specifies the character set for the table.

The `CONNECTION` parameter specifies the connection information for the remote server. Replace `remote_user`, `remote_password`, `remote_host`, `remote_port`, `remote_database`, and `remote_table` with the appropriate values for your remote server.

Once you have created the FEDERATED table, you can query and manipulate it just like any other table on your local server. Any changes you make to the FEDERATED table will be reflected on the remote server.