REVOKE
The REVOKE statement allows you to remove users and permissions.
General format
EXEC SQL [ AT Database ]
 
  REVOKE Options
 
END-EXEC
Syntax rules
1. Options is passed to the driver without further checks. Refer to the database documentation for detailed syntax. Syntax errors, if any, are returned at runtime.
General Rules
1. Database identifies the active connection that will execute the query and must be previously defined using a Format 4 DECLARE statement.
Examples
Revoke Update and Delete access privilege to a table from some users
exec sql
     revoke updatedelete on invoices
       from usr1, erollands
end-exec