MySQL error code: 1175 during UPDATE in MySQL Workbench

It is look like that MySql run with safe-updates option. It mean you can't update or delete record without key (ex. primary key) on where clause.

Try use:

SET SQL_SAFE_UPDATES = 0;

or you can modify your query to follow the rule (use primary key on where clause).

http://stackoverflow.com/questions/11448068/mysql-error-code-1175-during-update-in-mysql-workbench