MySQL

Create a remote user

CREATE USER 'sammy'@'remote_server_ip' IDENTIFIED WITH mysql_native_password|caching_sha2_plugin BY 'password';  
GRANT CREATE, ALTER, DROP, INSERT, UPDATE, DELETE, SELECT, REFERENCES, RELOAD on *.* TO 'sammy'@'remote_server_ip' WITH GRANT OPTION;
FLUSH PRIVILEGES;

Change host for a user

UPDATE mysql.user SET Host='%' WHERE Host='localhost' AND User='username';

Show columns statement

SHOW COLUMNS FROM City;

Query for big tables

SELECT 
     table_schema as `Database`, 
     table_name AS `Table`, 
     round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB` 
FROM information_schema.TABLES 
WHERE table_schema = "my_table"
ORDER BY (data_length + index_length) DESC;

Disable foreign key checks

SET foreign_key_checks = 0;
SET foreign_key_checks = 1;