SQL Server : How to combine multiple database into one database? - sql

Question

From my original database, I made changes to some tables with columns in the table, I want to merge them into a single database. New database just add some table and old table add some columns.
How to merge multiple database into one database?
SQL example:
CREATE TABLE [dbo].[Item]
(
[ItemID] [nchar](10) NOT NULL,
[Money] [bigint] NOT NULL,
[ItemName] [bigint] NOT NULL,
[MoneyType] [bigint] NOT NULL,
CONSTRAINT [PK_Item]
PRIMARY KEY CLUSTERED ([ItemID] ASC) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Account]
(
[Index] [int] IDENTITY(1,1) NOT NULL,
[AccountID] [nchar](10) NOT NULL,
[AccountName] [int] NOT NULL,
[ItemList] [int] NOT NULL,
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Money]
(
[AccountID] [nchar](10) NOT NULL,
[Money] [bigint] NOT NULL,
[MoneyType] [bigint] NOT NULL,
CONSTRAINT [PK_Money]
PRIMARY KEY CLUSTERED ([AccountID] ASC) ON [PRIMARY]
) ON [PRIMARY]
GO
-> Nick.McDermaid: use the schema compare tool in Visual Studio (various free editions) which will create a change script!

Answer 1

This will combine them onto DBCombined.Account if the Account table does NOT exist yet: the SELECT INTO code creates the target table. You would then need to add any indexes from the original tables. Also, "SELECT *" should really be broken out, listing each field, because if you have an ID field it will contain duplicates. Better to leave ID off during the insert and then go back and add an identity column.
USE DBCombined
GO
SELECT *
INTO Account
FROM (
SELECT *
FROM DB1.dbo.Account
UNION ALL
SELECT *
FROM DB2.dbo.Account
) Acct