You can enter the mysql console with:

mysql -u root -p

Then you can select a database

show databases;
use my_db;

Then you can see the tables

show tables;

To see the content of a given table:

select * from my_table;

To add a column named ’email’ to the table

ALTER TABLE table_name ADD email Text;

To check the datatype of the columns in a table

describe table_name

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