修改表 添加

ALTER TABLE DeliberInfo DROP CONSTRAINT PK_DeliberInfo --删除主键

ALTER TABLE DeliberInfo DROP COLUMN DeliberContSeqNo --删除列
ALTER TABLE DeliberInfo ADD DeliberContTime DATETIME NOT NULL DEFAULT '1900-01-01 00:00:00.000' --添加列，并设置默认值

--添加主键，注意数据中以下的三个字段不能重复
ALTER TABLE DeliberInfo
ADD CONSTRAINT PK_DeliberInfo PRIMARY KEY CLUSTERED
(
ConferenceNo ASC,
VerNum ASC,
DeliberContTime ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]