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 …

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 …

Jun 11, 2012 · It is perfectly fine to use a foreign key as the primary key if the table is connected by a one-to-one relationship, not a one-to-many relationship. If you want the same user record …

56 You are trying to insert a record with a value in the foreign key column that doesn't exist in the foreign table. For example: If you have Books and Authors tables where Books has a foreign …

Sep 18, 2008 · I have created a foreign key (in SQL Server) by: alter table company add CountryID varchar (3); alter table company add constraint Company_CountryID_FK foreign …

Jun 3, 2016 · To generate a foreign key you need to create first index of that field.After you create an index.Then go to relation view you will see that field also along with primary key .

Oct 14, 2008 · In MySQL, how do I get a list of all foreign key constraints pointing to a particular table? a particular column? This is the same thing as this Oracle question, but for MySQL.

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 …

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 …

the foreign key, cannot be null by default in mySQL, the reason is simple, if you reference something and you let it null, you will loose data integrity. when you create the table set allow …