Sql updating tables with foreign keys
moreover, we looked at how SQL Create Table Primary Key and SQL Create table Foreign Key.
Also, we discussed the Primary Key and Foreign Key in SQL examples.
In other words, only values that are supposed to appear in the database are permitted.
The purpose of the foreign key is to ensure referential integrity of the data.
A foreign key is a type of constraint, and so if you want to create a foreign key in SQL Server, you’ll need to create a foreign key constraint.
This article demonstrates how to create a foreign key constraint in SQL Server, using Transact-SQL.
It means that you can only insert a row into the child table if there is a corresponding row in the parent table.
First Argument is Identity Seed, second argument is Identity Increment value.(tmp_table.tplname, tmp_table.source, tmp_table.domain together can be used to determine template.id).