refers to the consistency rules provided by the foreign-key constraints in a database that control the behavior of Inserting, Updating, and Deleting related records.For example, it is referential integrity that forces you to create a customer record before you create orders for that customer.EDIT 2: The information that you need is found in sys.foreign_keys.
It is possible to implement other semantics using triggers.
Additionally, My SQL requires that the referenced columns be indexed for performance reasons.
Bill explores the basic syntax, using SQL statements to create, insert, update, and delete data from your tables.
He also covers creating a new database from scratch, as well as data types, transactions, subselects, views, and stored routines.
Thus NO ACTION is taken after updating my primary keys columns.
How can I update the foreign keys to make them ON CASCADE UPDATE ?
When you drop a table, any constraints that were defined in the statement used to create that table are also dropped.
If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it.
My SQL is by far the most popular database management system for small- to medium-sized web projects.