Question

I have the SQL below. SQL return a Users.Id which are not found in Order table. I need to create Insert SQL and insert default order for these users. How to do that?

SELECT  Id
FROM    [User] WHERE Id NOT IN (SELECT UserId FROM dbo.[Order])

Order table columns are

      Id , --  Random Number 
      UserId , -- Id from Select above
      FirstName ,
      LastName ,
      Credits

Answer 1

Assuming dbo.[User] has the FirstName, LastName and Credits columns you can do it like this:

Insert Into dbo.[Order] (UserId, FirstName, LastName, Credits)
SELECT  u.Id, u.FirstName, u.LastName, u.Credits
FROM    [User] u WHERE u.Id NOT IN (SELECT o.UserId FROM dbo.[Order] o)

You can see here for another example. You might understand it 🙂

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To generate the Unique Id use the Identity Property.