I have 2 tables: survey (id(PK), name)
and survey_to_topic (survey_id(PK,FK,not null), topic_id(PK,FK,not null))
. When I try to delete from survey table, I get exception:
"The DELETE statement conflicted with the REFERENCE constraint "FK_survey _to _topic _survey". The conflict occurred in database "mydatabase", table "dbo.survey _to _topic", column 'survey _id'."
So to get no error first I must delete record from table survey_to_topic and after that from table survey. I think it is better to do with before trigger on table survey, but I can't find any information about this. There are a lot of articles about before triggers in PL/SQL, but I use SQL Server.