Foreign keys are a data integrity feature of relational (and SQL) databases.
I am trying to drop a number of foreign keys using: ALTER TABLE `table` DROP FOREIGN KEY `fk_table_users1` , …
mysql foreign-keys alter-tableI have following comments table in my app: comments -------- id INT foreign_id INT model TEXT comment_text TEXT ... …
mysql sql database-design foreign-keys polymorphic-associationsLet's take a stupid example : I have many domestic animals, each one with a NAME as an id and a …
sql database database-design foreign-keys multiple-tablesI prepared a fiddle which demonstrates the problem. CREATE TABLE parent ( parent_id integer primary key ); CREATE TABLE child ( child_…
sql postgresql database-design foreign-keys cascadeI am trying to delete from multiple tables. Here's what my tables look like A_has_B ---- B ---- …
mysql sql foreign-keys sql-deleteI've read multiple questions about this, but have yet to find an answer that works for my situation. I have 3 …
ruby-on-rails foreign-keys associations has-many-throughWhat is the advantage of defining a foreign key when working with an MVC framework that handles the relation? I'm …
sql-server database-design foreign-keys relational-databaseI'm receiving an error when I attempt to create two tables. There was a multivalued dependency, so I separated the …
mysql sql database foreign-keys mysql-error-1452I'm trying to modify a M2M field to a ForeignKey field. The command validate shows me no issues and …
django foreign-keys migration manytomanyfieldI am not clever from ORMlite documentation. Is is possible to declare in class, that this parameter is foreign key? …
android foreign-keys ormlite