WebSo first add a new index on the column that is needed for the foreign key constraint, and then you can drop the compound key. Share. Improve this answer. Follow answered Nov 14, 2016 at 8:27. rdcl rdcl. 21 4 ... Drop the foreign key; Drop the unique composite index; Create the foreign key again; E.g. WebSep 23, 2024 · Issue: #1553 – Cannot drop index ‘index_name’: needed in a foreign key constraint An issue is generally faced when we are going to drop a unique index from a table. For example, here I have the table articles that have the following structure: Column Data type Specifications id int(11) PRIMARY KEY company_id int(11) NOT NULL, […]
sql - Drop Column with foreign key in MySQL - Stack Overflow
WebFeb 16, 2014 · Jul 24, 2024 at 10:33. First you need to drop the foreign key using the query: ALTER TABLE db_name.table_name DROP FOREIGN KEY foreign_key; On creation of table an index for foreign key will be created, which should also be deleted using the query: ALTER TABLE test.exam DROP INDEX id ; – Hithaisri M K. WebAug 1, 2014 · the reason why you cannot drop InstructorID is because you need to use the name of the constraint of the Foreign key . KevDev specified that you must run 'SHOW CREATE TABLE course' to find the constraint name. after doing so , you can delete the foreign key. BUT wait theres more, the 'key' still stays behind which must get deleted. how do you spell prismarine
mysql - General error: 1553 - Stack Overflow
WebMay 13, 2024 · Minimal – Use as little code as possible that still produces the same problem Complete – Provide all parts someone else needs to reproduce your problem in the question itself Reproducible – Test the code you're about to provide to make sure it reproduces the problem Restart from scratch. WebJan 22, 2024 · Failed to add the foreign key constraint. Missing index for constraint 'holiday' in the referenced table 'base_calendars_generated'. For that you need a an index for a foreign key that is mandatory. usually it is a primary key so you don't need aditional indexes. but in your case working_day is not indexes. So chenge yout tbale. WebJul 18, 2016 · Django 1.9 drop foreign key in migration. I want to keep the underlying DB column as a field, but to get rid of the foreign key constraint in the database. class Example (models.Model): something_id = models.IntegerField () And, to be clear, something_id is the column that Django had created for the foreign key field. phone won\u0027t charge says it detects water