向數據表新增一個列

https://stackoverflow.com/questions/12678208/altering-sql-table-to-add-column

IF NOT EXISTS ( SELECT 1
FROM sysobjects
INNER JOIN syscolumns ON sysobjects.id = syscolumns.id
WHERE sysobjects.name = N‘tbm_den_DynamicEntity‘
AND syscolumns.name = N‘EnableHistory‘
)
ALTER TABLE [dbo].[tbm_den_DynamicEntity
 
]
ADD EnableHistory BIT;

Alert 新增一列，可重復執行的