MySQL Update Query using a left join

Question

Table Schema

Table Name: file_manager_folder

Rows: id , parentId, name

My query

Answer 1

I think this should be solved using a unique constraint/index on the parentid and name columns. Otherwise, anyone with INSERT/UPDATE access to the table can circumvent your business rule.

CREATE UNIQUE INDEX blah_uk ON FILE_MANAGER_FOLDER(parentId, name) USING BTREE