A foreign key (FK) is a column or set of columns used to create and enforce a link between data in two tables in order to limit the amount of data that may be stored in the foreign key table.
A primary key is used to ensure that each column's value is unique. The foreign key is what connects the two tables together.
A foreign key is a column (or a concatenation of columns) in a table that is identical to the primary key of another table in the database. In a relational database, the matching of foreign key values to main key values reflects data relationships.
You can use a key and cross-domain analysis job to locate foreign key candidates, pick foreign keys, and then check their referential integrity to build and validate table relationships. In the Key and Cross-Domain Analysis workspace, you find foreign keys.
The column or columns that hold values that uniquely identify each row in a table are referred to as the main key. To insert, edit, recover, or delete data from a database table, the table must have a primary key.
The course is very good. I have stuck at a point that how you create multiple rows with a single insert in sales.customer table. I get only one customer data. this table is related to bikestore data.
very useful thank you learnvern
Very Good trainer
you guys are doing nice job. thanks
Not too much interactive
Well Explained in Every Chapters..
GAJANAN DIGAMBAR MODE
very easy to understand SQL its was dream to learn SQL. Thanx for Learnvern
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