Do you know where the names MySQL, MaxDB and MariaDB come from?
Michael Widenius is the main author of the original version of the open source MySQL database,
a founding member of the MySQL AB company and is currently CTO of the MariaDB Corporation Ab.
He lives in Helsinki with his second wife Anna and daughter Maria (after whom MariaDB was named),
and has a daughter My (after whom MySQL was named) and a son Max (giving the name for MaxDB) from his first marriage.
Mysql. Replication is synchronous?
Replication is asynchronous by default; slaves do not need to be connected permanently to receive updates from the master.
Depending on the configuration, you can replicate all databases, selected databases, or even selected tables within a database.
From the reference manual: https://dev.mysql.com/doc/refman/5.7/en/replication.html
MySQL : What the result is of the query
Mysql. Is this query valid?
SELECT id, COUNT(*) AS cnt FROM table1 WHERE cnt > 0 GROUP BY id;
MySQL : Which one of the following expression is not correct: