find all columns in oracle named as district_id

I had a problem today. it was about changing all district_id in a whole database. so I need to find who used district_id as column name in tables in oracle.

here is how I find it.
Select COLUMN_NAME,table_name from user_tab_columns where table_name in ( select object_name from user_objects where object_type='TABLE' ) and COLUMN_NAME ='DISTRICT_ID' and I changed all values from found tables.