创建删除主外键和创建字段(非空)

ADD the Lang COLUMN

IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'Merchandising_Snippets' AND table_schema = 'dbo' AND column_name = 'Lang')
BEGIN
    ALTER TABLE Merchandising_Snippets ADD Lang nvarchar(10)
END
GO

UPDATE Merchandising_Snippets SET Lang='en' WHERE Lang is null
GO

IF EXISTS (SELECT * FROM Information_schema.columns
WHERE table_name = 'Merchandising_Snippets'
AND column_name = 'Lang'
AND is_nullable = 'YES')
BEGIN
    ALTER TABLE Merchandising_Snippets
    ALTER COLUMN Lang nvarchar(10) not null
END
GO


IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'Merchandising_Snippet_Resources' AND table_schema = 'dbo' AND column_name = 'Lang')
BEGIN
    ALTER TABLE Merchandising_Snippet_Resources ADD Lang nvarchar(10)
END
GO


UPDATE Merchandising_Snippet_Resources SET Lang='en' WHERE Lang is null
GO

IF EXISTS (SELECT * FROM Information_schema.columns
WHERE table_name = 'Merchandising_Snippet_Resources'
AND column_name = 'Lang'
AND is_nullable = 'YES')
BEGIN
    ALTER TABLE Merchandising_Snippet_Resources
    ALTER COLUMN Lang nvarchar(10) not null
END
GO


--DELETE FOREIGN and PRIMARY KEYS

IF EXISTS (SELECT * FROM sys.foreign_keys
    WHERE name='FK_Merchandising_Schedule_Merchandising_Snippets'
    AND parent_object_id = OBJECT_ID(N'[dbo].[Merchandising_Schedule]'))
BEGIN
    alter table dbo.Merchandising_Schedule drop constraint FK_Merchandising_Schedule_Merchandising_Snippets
END
GO

IF EXISTS (SELECT * FROM sys.indexes
    WHERE name='PK_Merchandising_Snippet_Resources'
    AND object_id = OBJECT_ID(N'[dbo].[Merchandising_Snippet_Resources]'))

BEGIN
    alter table Merchandising_Snippet_Resources drop constraint PK_Merchandising_Snippet_Resources
END
GO

IF EXISTS (SELECT * FROM sys.foreign_keys
    WHERE name='FK_Merchandising_Snippet_Resources_Merchandising_Snippets'
    AND parent_object_id = OBJECT_ID(N'[dbo].[Merchandising_Snippet_Resources]'))
BEGIN
    alter table Merchandising_Snippet_Resources drop constraint FK_Merchandising_Snippet_Resources_Merchandising_Snippets
END
GO

IF EXISTS (SELECT * FROM sys.indexes
    WHERE name='PK_Merchandising_Snippets'
    AND object_id = OBJECT_ID(N'[dbo].[Merchandising_Snippets]'))
BEGIN
    alter table Merchandising_Snippets drop constraint PK_Merchandising_Snippets
END
GO

--CREATE THE PRIMARY and FOREIGN KEYS

ALTER TABLE [dbo].[Merchandising_Snippets]
ADD CONSTRAINT [PK_Merchandising_Snippets] PRIMARY KEY CLUSTERED
(
    [SnippetID] ASC,
    [Lang] ASC
)

ALTER TABLE [dbo].[Merchandising_Snippet_Resources]
ADD CONSTRAINT [PK_Merchandising_Snippet_Resources] PRIMARY KEY CLUSTERED
(
    [SnippetID] ASC,
    [ResourceID] ASC,
    [Lang] ASC
)

ALTER TABLE [dbo].[Merchandising_Snippet_Resources] WITH CHECK ADD CONSTRAINT [FK_Merchandising_Snippet_Resources_Merchandising_Snippets]
FOREIGN KEY([SnippetID],[Lang]) REFERENCES [dbo].[Merchandising_Snippets]([SnippetID],[Lang])

--ADD BACK THE FK FROM Merchandising_Schedule?
--ALTER TABLE [dbo].[Merchandising_Schedule] WITH CHECK ADD CONSTRAINT [FK_Merchandising_Schedule_Merchandising_Snippets]
--FOREIGN KEY([SnippetID]) REFERENCES [dbo].[Merchandising_Schedule]([SnippetID])

GO

/*REP ADD ARTICLE Merchandising_Snippet_Resources*/
/*REP ADD ARTICLE Merchandising_Snippets*/