ALTER TABLE [#__associations] DROP CONSTRAINT [PK_#__associations_context]; ALTER TABLE [#__associations] ALTER COLUMN [id] INT NOT NULL; ALTER TABLE [#__associations] ADD CONSTRAINT [PK_#__associations_context] PRIMARY KEY CLUSTERED( [context] ASC, [id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY];