MySQL show all grants
No need to run a query - just input 

SHOW GRANTS;


If you have sufficient privileges, you should get all their privileges. 

A bit more fine-grained is the following query

mysql&gt; SELECT grantee, table_catalog, table_schema, privilege_type, is_grantable
 FROM schema_privileges;


This way, you can do it by user, &amp;c. BTW, you have to run this from the information_schema. This information 

This page should also be of use.

Using the mysql schema, you can issue the query

mysql&gt; SELECT Host, Db, User, Table_name, Column_name, Column_priv FROM columns_
priv;


From this page.