sql-server - SQL Server で一度に複数の列を変更する方法

Question

ALTERテーブル内の複数の列のデータ型が必要です。

単一の列の場合、次は正常に機能します。

ALTER TABLE tblcommodityOHLC
ALTER COLUMN
    CC_CommodityContractID NUMERIC(18,0)

しかし、1 つのステートメントで複数の列を変更するにはどうすればよいでしょうか。以下は機能しません。

ALTER TABLE tblcommodityOHLC
ALTER COLUMN
    CC_CommodityContractID NUMERIC(18,0), 
    CM_CommodityID NUMERIC(18,0)

score 163 · Accepted Answer

これは不可能です。これを 1 つずつ行う必要があります。あなたは出来る：

変更した列を含む一時テーブルを作成します
データをコピーします
元のテーブルをドロップします (前に再確認してください!)
一時テーブルの名前を元の名前に変更します

score 41 · Accepted Answer

1 つのステートメント内で複数のALTER COLUMNアクションを実行することはできません。ALTER TABLE

ここALTER TABLEで構文を参照してください

ADD複数または複数のを実行できますDROP COLUMNが、1 つだけALTER COLUMNです。

score 27 · Accepted Answer

ALTER TABLE他の人が答えたように、複数のステートメントが必要です。
以下を試してください：

ALTER TABLE tblcommodityOHLC alter column CC_CommodityContractID NUMERIC(18,0);
ALTER TABLE tblcommodityOHLC alter column CM_CommodityID NUMERIC(18,0);

score 1 · Accepted Answer

管理スタジオで変更を行い、スクリプトを生成すると、新しいテーブルが作成され、変更されたデータ型で古いデータが挿入されます。2 つの列のデータ型を変更する小さな例を次に示します。

/*
   12 August 201008:30:39
   User: 
   Server: CLPPRGRTEL01\TELSQLEXPRESS
   Database: Tracker_3
   Application: 
*/

/* 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
ALTER TABLE dbo.tblDiary
    DROP CONSTRAINT FK_tblDiary_tblDiary_events
GO
ALTER TABLE dbo.tblDiary_events SET (LOCK_ESCALATION = TABLE)
GO
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_tblDiary
    (
    Diary_ID int NOT NULL IDENTITY (1, 1),
    Date date NOT NULL,
    Diary_event_type_ID int NOT NULL,
    Notes varchar(MAX) NULL,
    Expected_call_volumes real NULL,
    Expected_duration real NULL,
    Skill_affected smallint NULL
    )  ON T3_Data_2
     TEXTIMAGE_ON T3_Data_2
GO
ALTER TABLE dbo.Tmp_tblDiary SET (LOCK_ESCALATION = TABLE)
GO
SET IDENTITY_INSERT dbo.Tmp_tblDiary ON
GO
IF EXISTS(SELECT * FROM dbo.tblDiary)
     EXEC('INSERT INTO dbo.Tmp_tblDiary (Diary_ID, Date, Diary_event_type_ID, Notes, Expected_call_volumes, Expected_duration, Skill_affected)
        SELECT Diary_ID, Date, Diary_event_type_ID, CONVERT(varchar(MAX), Notes), Expected_call_volumes, Expected_duration, CONVERT(smallint, Skill_affected) FROM dbo.tblDiary WITH (HOLDLOCK TABLOCKX)')
GO
SET IDENTITY_INSERT dbo.Tmp_tblDiary OFF
GO
DROP TABLE dbo.tblDiary
GO
EXECUTE sp_rename N'dbo.Tmp_tblDiary', N'tblDiary', 'OBJECT' 
GO
ALTER TABLE dbo.tblDiary ADD CONSTRAINT
    PK_tblDiary PRIMARY KEY NONCLUSTERED 
    (
    Diary_ID
    ) WITH( PAD_INDEX = OFF, FILLFACTOR = 86, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON T3_Data_2

GO
CREATE UNIQUE CLUSTERED INDEX tblDiary_ID ON dbo.tblDiary
    (
    Diary_ID
    ) WITH( PAD_INDEX = OFF, FILLFACTOR = 86, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON T3_Data_2
GO
CREATE NONCLUSTERED INDEX tblDiary_date ON dbo.tblDiary
    (
    Date
    ) WITH( PAD_INDEX = OFF, FILLFACTOR = 86, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON T3_Data_2
GO
ALTER TABLE dbo.tblDiary WITH NOCHECK ADD CONSTRAINT
    FK_tblDiary_tblDiary_events FOREIGN KEY
    (
    Diary_event_type_ID
    ) REFERENCES dbo.tblDiary_events
    (
    Diary_event_ID
    ) ON UPDATE  CASCADE 
     ON DELETE  CASCADE 

GO
COMMIT

score 0 · Accepted Answer

-- create temp table 
CREATE TABLE temp_table_alter
(
column_name varchar(255)    
);

-- insert those coulmns in temp table for which we nee to alter size of columns 
INSERT INTO temp_table_alter (column_name) VALUES ('colm1');
INSERT INTO temp_table_alter (column_name) VALUES ('colm2');
INSERT INTO temp_table_alter (column_name) VALUES ('colm3');
INSERT INTO temp_table_alter (column_name) VALUES ('colm4');

DECLARE @col_name_var varchar(255);
DECLARE alter_table_cursor CURSOR FOR
select column_name from temp_table_alter ;

OPEN alter_table_cursor
FETCH NEXT FROM alter_table_cursor INTO @col_name_var
WHILE @@FETCH_STATUS = 0
 BEGIN

 PRINT('ALTER COLUMN ' + @col_name_var);
 EXEC ('ALTER TABLE Original-table  ALTER COLUMN ['+ @col_name_var + '] DECIMAL(11,2);')

 FETCH NEXT FROM alter_table_cursor INTO @col_name_var
 END

CLOSE alter_table_cursor
DEALLOCATE alter_table_cursor

-- at the end drop temp table
drop table temp_table_alter;

score 0 · Accepted Answer

select 'ALTER TABLE ' + OBJECT_NAME(o.object_id) + 
    ' ALTER COLUMN ' + c.name + ' DATETIME2 ' + 
    CASE WHEN c.is_nullable = 0 THEN 'NOT NULL' ELSE 'NULL' END
from sys.objects o
inner join sys.columns c on o.object_id = c.object_id
inner join sys.types t on c.system_type_id = t.system_type_id
where o.type='U'
and c.name = 'Timestamp'
and t.name = 'datetime'
order by OBJECT_NAME(o.object_id)

デビオの礼儀

score -3 · Accepted Answer

ALTER COLUMN括弧内にステートメントを入れると、うまくいくはずです。

ALTER TABLE tblcommodityOHLC alter ( column  
CC_CommodityContractID NUMERIC(18,0), 
CM_CommodityID NUMERIC(18,0) )

sql-server - SQL Server で一度に複数の列を変更する方法

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