Mixed

Can a foreign key be used in multiple tables?

A table can have multiple foreign keys based on the requirement.

How do you insert data into multiple tables with a foreign key using EF core?

Insert Records In Two Tables In Foreign Key Relationship Using Entity Framework Core

  1. Step 1 – We will create table in SQL Server.
  2. Create Model Classes using scaffold command in the .
  3. You can see the two classes in Models directory.
  4. Now we directly go to the Insert method which will insert the record in both tables:

Can you insert into multiple tables at once SQL?

The T-SQL function OUTPUT, which was introduced in 2005, can be used to insert multiple values into multiple tables in a single statement. The output values of each row that was part of an INSERT, UPDATE or DELETE operation are returned by the OUTPUT clause.

How insert data into table that has foreign key?

If you are inserting data into a dependent table with foreign keys:

  1. Each non-null value you insert into a foreign key column must be equal to some value in the corresponding parent key of the parent table.
  2. If any column in the foreign key is null, the entire foreign key is considered null.

Can a foreign key reference multiple tables in SQL?

Q: Can a foreign key reference 2 or more tables? A: No, it can’t.

Can a foreign key reference two tables SQL?

The FOREIGN KEY constraint is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.

How can insert data in multiple tables at the same time in ASP Net?

Steps

  1. Create a asp.net web application in visual studio using empty mvc template.
  2. Create data base for this applications using below sql script code.
  3. Here i created 3 tables TUser,TAddress and TOrders where i am maintaining relationship between three tables using userid.

How can insert data in child and parent table in mysql?

Insert data in Parent and child table

  1. CREATE TABLE parent (ParentId int NOT NULL,
  2. ParentName varchar(20) NOT NULL,
  3. CONSTRAINT pk_parent PRIMARY KEY (ParentId)
  4. )
  5. go.
  6. CREATE TABLE child (ParentId int NOT NULL,
  7. ChildNo int NOT NULL,
  8. ChildName varchar(20) NOT NULL,

How do I insert multiple tables in a table?

To insert records from multiple tables, use INSERT INTO SELECT statement. Here, we will insert records from 2 tables.

How do you drop a foreign key constraint in SQL?

To delete a foreign key constraint

  1. In Object Explorer, expand the table with the constraint and then expand Keys.
  2. Right-click the constraint and then click Delete.
  3. In the Delete Object dialog box, click OK.