How can alter existence tables to SQL Temporal table by keeping data?

Question

I have many table with data, which I want to convert to Microsoft Temporal table, But when I want to convert temporal table cause lost my data. My code is:

Alter TABLE dbo.Employee   
(    
  [EmployeeID] int NOT NULL PRIMARY KEY CLUSTERED   
  , [Name] nvarchar(100) NOT NULL  
  , [Position] varchar(100) NOT NULL   
  , [Department] varchar(100) NOT NULL  
  , [Address] nvarchar(1024) NOT NULL  
  , [AnnualSalary] decimal (10,2) NOT NULL  
  , [ValidFrom] datetime2 (2) GENERATED ALWAYS AS ROW START  
  , [ValidTo] datetime2 (2) GENERATED ALWAYS AS ROW END  
  , PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo)  
 )    
 WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.EmployeeHistory)); 

how can alter existence tables to Sql temporal table by keeping data?

Answer 1

1. Create your temporal table.

2. Insert the data from your original table to the temporal table.

3. Drop your original table.