I hace 4 table in my database
1. Publisher Table
Attributes : ID (primary key,autoincrement) ,Name,City,Address,State
2 Author Table
Attributes : ID (primary key,autoincrement),Firstname,Lastname
3 Book Table
Attributes: ID(primary key,autoincrement),title,PublisherID (Foreign Key with Publisher ID)
4.Book_Author_MAP Table
Attributes: ID(primary key,autoincrement),BookID,AuthorID(Foreign Key with Author ID)
In all tables ID is only unique no one data is unique.
Now I have single form in ASP.net that takes input Publisher-> Name,City,Address,State,
Authors -> Firstname,Lastname,
Book -> Title
All the field will show on browser But when I submit the form I want to store all value in all table. But when firstly I save Publiser values but how can i find ID of publisher at that time because No one data in unique without ID and Book table ID attributes required publisher ID that time.How can I fetch ID of publisher.