If using MySQL 5.6, you can use the performance schema, and look at the different statements summaries there.
There are summaries by account (someuser@somehost), by username alone (someuser) or by host alone (somehost).
See the following tables:
- performance_schema.events_statements_summary_by_account_by_event_name
- performance_schema.events_statements_summary_by_user_by_event_name
- performance_schema.events_statements_summary_by_host_by_event_name
- performance_schema.events_statements_summary_global_by_event_name
http://dev.mysql.com/doc/refman/5.6/en/performance-schema.html