Inserto into ( Select ) with not auto increment - sql

Question

Have two tables
CREATE TABLE [dbo].[TABELAA]
(
[ID] [bigint] NOT NULL,
[PodatakA] [nvarchar](50) NULL,
[PodatakB] [nvarchar](50) NULL,
CONSTRAINT [PK_TABELAA]
PRIMARY KEY CLUSTERED ([ID] ASC)
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF,
IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON,
ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TABELAB]
(
[PodatakX] [nvarchar](50) NULL,
[PodatakY] [nvarchar](50) NULL
) ON [PRIMARY]
GO
I need to insert value from tabelaB to tabelaA with autogenerating ID in tabelaA so I need something like this. But this would be great if there is only one row. I'm talking about thousands of rows where it should auto generate id exact like AutoIncrement (1)
Useless try where I think I should use OVER
INSERT INTO TABELAA
SELECT
(SELECT MAX(id) + 1 FROM TabelaA) AS Id, *
FROM
tabelaB

Answer 1

You are looking for the IDENTITY:
CREATE TABLE [dbo].[TABLAAA](
[ID] [bigint] IDENTITY(1, 1) PRIMARY KEY, -- NOT NULL is handled by PRIMARY KEY
[PodatakA] [nvarchar](50) NULL,
[PodatakB] [nvarchar](50) NULL
);
INSERT INTO TABLEAA (PodatakA, PodatakB)
SELECT PodatakA, PodatakB
FROM TABLEBB;

Answer 2

I agree with Rahul's comment and Gordon that if you can modify your schema it would make the most sense to add an Identity Column. However if you cannot you can still accomplish what you want using a couple of methods.
One method is get the MAX ID of TableAA and then add a ROW_NUMBER() to it like so:
INSERT INTO TableAA (ID, PodatakA, PodatakB)
SELECT
m.CurrentMaxId + ROW_NUMBER() OVER (ORDER BY (SELECT NULL))
,b.PodatakA
,b.PodatakB
FROM
TableAB b
CROSS APPLY (
SELECT ISNULL(MAX(Id),0) as CurrentMaxId
FROM
TableAA) m
Again this would be work around the most ideal solution is to specify IDENTITY
Also this is susceptible to problems due to simultaneous writes and other scenarios in a heavy traffic DB.