问题
I keep getting an error every time i try to drop a table called "countires" and a field called "countries".
#1025 - Error on rename of '.\mutli_page_form\survey'
to '.\mutli_page_form\#sql2-820-1fb' (errno: 152)
It says there is a FK dependency on the table "survey" i have tried multiple times to delete it to no success.
#1217 - Cannot delete or update a parent row: a foreign key constraint fails
I now get this error once trying to delete the table of Countries
回答1:
The database has been told to ensure data integrity. This is what you're seeing. There is survey data that references a country. If you delete the country table then the survey data won't have valid countries associated with it. You'll have to remove the surveys first before you can remove the countries.
回答2:
You must set index both for id ()'s in 2 tables -> after try again
来源：https://stackoverflow.com/questions/5343406/sql-foreign-key-constraint-error-1025-152