答案是肯定的,這在技術上是可行的,但你將有一個頭痛這樣做,這將需要很長的時間來執行,併成立。
一:創建/複製/刪除/重命名
這實際上是什麼樣的SQL Server是在做圖形界面:這裏是它的產生,當你點擊「保存」執行腳本的例子在將新列添加到表的開頭之後按鈕。
/* To prevent any potential data loss issues, you should review this script in detail before running it outside the context of the database designer.*/
BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_SomeTable
(
MyNewColumn int NOT NULL,
OriginalIntColumn int NULL,
OriginalVarcharColumn varchar(100) NULL
) ON [PRIMARY]
TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE dbo.Tmp_SomeTable SET (LOCK_ESCALATION = TABLE)
GO
SET IDENTITY_INSERT dbo.Tmp_SomeTable ON
GO
IF EXISTS(SELECT * FROM dbo.SomeTable)
EXEC('INSERT INTO dbo.Tmp_SomeTable (OriginalIntColumn, OriginalVarcharColumn FROM dbo.SomeTable WITH (HOLDLOCK TABLOCKX)')
GO
SET IDENTITY_INSERT dbo.Tmp_SomeTable OFF
GO
DROP TABLE dbo.SomeTable
GO
EXECUTE sp_rename N'dbo.Tmp_SomeTable', N'SomeTable', 'OBJECT'
GO
GO
COMMIT
二:ADD COLUMN/UPDATE/DROP COLUMN /重命名
這個方法基本上涉及創建要添加到您的新列的 '正確' 的任何現有列的副本,將數據傳輸到新列,然後刪除原件並重新命名。這會對任何索引或限制造成嚴重破壞,因爲您必須重新指定它們。這在技術上是可行的,但是在開發和執行方面又耗費時間。
CREATE TABLE MyTest (a int, b int, d int, e int)
INSERT INTO MyTest (a,b,d,e) VALUES(1,2,4,5)
SELECT * FROM MyTest -- your current table
ALTER TABLE MyTest ADD c int -- add a new column
ALTER TABLE MyTest ADD d_new int -- create copies of the existing columns you want to move
ALTER TABLE MyTest ADD e_new int
UPDATE MyTest SET d_new = d, e_new = e -- transfer data to the new columns
ALTER TABLE MyTest DROP COLUMN d -- remove the originals
ALTER TABLE MyTest DROP COLUMN e
EXEC SP_RENAME 'MyTest.d_new', 'd'; -- rename the new columns
EXEC SP_RENAME 'MyTest.e_new', 'e';
SELECT * FROM MyTest
DROP TABLE MyTest -- clean up the sample
三:與它生活
這強烈地冒犯了我的秩序感......但有時,它只是不值得重新洗牌。
或者這就是爲什麼我應該在每張桌子上創建視圖的原因? – 2009-04-20 19:54:44
相關:http://stackoverflow.com/q/1605144/12484 – 2017-02-08 15:44:00