Insert into one table2 from table1 get the id and then insert into table3 SQL server

Question

I came across a situation where

1. I need to insert multiple rows of data from a table1 into table2
2. With each row insert into table2, I need to get the scope ID and insert that with more data into table3

I have come up with something like below, but it appears it keeps inserting the same scope id over and over into table3.

insert into dbo.table2(name_client, phone_client)
SELECT name_client, phone_client
from dbo.table1 where name_client is not null

declare @clientID INT = SCOPE_IDENTITY()

insert into dbo.table3(......, client_id)
SELECT ......., @clientID from table1 --where some condition

Answer 1

You can use OUTPUT clause to get the inserted identity values to table variable. Use the table variable to insert into the third table.

Sample code is given below:

-- Declare table variable
DECLARE @tableName Table(ClientId INT,name_client VARCHAR(25), 
phone_client VARCHAR(25))

--Use OUTPUT clause to get results into table variable
insert into dbo.table2(name_client, phone_client)
OUTPUT inserted.ClientId, inserted.name_client, inserted.phone_client INTO @tableName
SELECT name_client, phone_client
from dbo.table1 where name_client is not null;

--Utilize the table variable to insert into third table
insert into dbo.table3(......, name_client, phone_client, client_id)
SELECT .......,name_client, phone_client, tv.clientID from @tableName tv 
--where some condition