Question

Is there a query like

pseudo-code:

SELECT databases FROM mysql.databases WHERE owner = 'myUser'

or any query that’d do the job?

Answer 1

SELECT COUNT(*) FROM information_schema.SCHEMATA;

(run as the user in Question)

SELECT count(*) FROM (
  SELECT DISTINCT TABLE_SCHEMA FROM information_schema.SCHEMA_PRIVILEGES WHERE GRANTEE LIKE("'USERNAME'%") GROUP BY TABLE_SCHEMA
) AS baseview;

(Run as root)

Caveat: There is no such thing as an “Owner” for a database in MySQL, the above queries will show information about the databases a user has soem sort of access to.