Cannot truncate table because it is being referenced by a …
Oct 31, 2008 · Because TRUNCATE TABLE is a DDL command, it cannot check to see whether the records in the table are being referenced by a record in the child table. This is why …
How do I create a foreign key in SQL Server? - Stack Overflow
I have never "hand-coded" object creation code for SQL Server and foreign key decleration is seemingly different between SQL Server and Postgres. Here is my sql so far: drop table …
sql - Foreign key constraint may cause cycles or multiple cascade …
When I try to add constraints to my tables I get the error: Introducing FOREIGN KEY constraint 'FK74988DB24B3C886' on table 'Employee' may cause cycles or multiple cascade paths. …
How can I list all foreign keys referencing a given table in SQL …
Jan 27, 2009 · I need to remove a highly referenced table in a SQL Server database. How can I get a list of all the foreign key constraints I will need to remove in order to drop the table? (SQL …
How do I use cascade delete with SQL Server? - Stack Overflow
To add "Cascade delete" to an existing foreign key in SQL Server Management Studio: First, select your Foreign Key, and open its "DROP And CREATE To.." in a new Query window. …
Cannot delete or update a parent row: a foreign key constraint fails
Dec 15, 2009 · When doing: DELETE FROM `jobs` WHERE `job_id` =1 LIMIT 1 It errors: #1451 - Cannot delete or update a parent row: a foreign key constraint fails …
sql - Foreign Key to non-primary key - Stack Overflow
Aug 26, 2013 · 278 If you really want to create a foreign key to a non-primary key, it MUST be a column that has a unique constraint on it. From Books Online: A FOREIGN KEY constraint …
sql - When to use "ON UPDATE CASCADE" - Stack Overflow
Sep 26, 2009 · Note that the foreign key columns must be nullable for this action to execute. ON UPDATE SET DEFAULT: SQL Server sets the default values for the rows in the child table …
sql - What is difference between foreign key and reference key?
Dec 22, 2011 · A foreign key value in one row is said to "reference" the row that contains the corresponding key value. Note the word "reference" in the prior sentence is a verb, so we may …
Create a one to many relationship using SQL Server
Aug 20, 2009 · Define two tables (example A and B), with their own primary key Define a column in Table A as having a Foreign key relationship based on the primary key of Table B This …