将数据从一列复制到另一列

Question

I have two database tables belonging to different databases, one empty and one not empty. I'm transferring data column by column to empty database table.

First I transferred names like this :

INSERT INTO [newdb].[dbo].[Person] (Name) 
   SELECT name
   FROM [olddb].[dbo].[members]

then I updated a column which is all NULL like this :

UPDATE [newdb].[dbo].[Person] 
SET IsApproved = 'True' 
WHERE IsApproved IS NULL

Now I want to update another null column in new database using the values in the old database. Can you tell me how I can carry values from old database where all cells are NULL in the new database. Thanks.

Answer 1

Query is for update only :-

UPDATE New 
SET New.Caption = Old.Caption ,New.Created_By =Old.Created_By 
FROM [NewDB].Dbo.Product New 
JOIN [OldDB].Dbo.Product Old ON New.Id = Old.Id 
WHERE New.Is_Cos IS NULL

Answer 2

You can use JOIN . Could be something like that:

The INNER JOIN keyword selects all rows from both tables as long as there is a match between the columns in both tables.

UPDATE NewTable
SET N.Col = O.Col
FROM [NewDB].[dbo].[NewTable] N
INNER JOIN [OldDB].[dbo].[OldTable] O
ON N.etc = O.etc
WHERE N.Col IS NULL