Get Id from first table in transaction

Question

I got this two tables for example

and I need to made transaction that input data in this tables. How can I get Id that is input in firstTable, and set it as Foreign key FirstTableId in second table?

BEGIN TRANSACTION
INSERT INTO FirsTable (Name) VALUES ('example1')

INSERT INTO SecondTable (Name, FirstTableId) VALUES ('example2', ?)

COMMIT TRANSACTION

Answer 1

Considering id is an identity , Use @@IDENTITY as next:-

BEGIN TRANSACTION
INSERT INTO FirsTable (Name) VALUES ('example1')

INSERT INTO SecondTable (Name, FirstTableId) VALUES ('example2', @@IDENTITY)

COMMIT TRANSACTION 

For More details .

UPDATE:-

For Non identity columns, Use table variable to get id via using Output , as next:-

BEGIN TRANSACTION
DECLARE @id int
DECLARE @table table (id int)

INSERT INTO FirsTable (Name) 
OUTPUT inserted.id into @table
VALUES ('example1')
SELECT @id = id from @table

INSERT INTO SecondTable (Name, FirstTableId) VALUES ('example2',  @id)

COMMIT TRANSACTION

For More details