mssql清空数据和添加主键约束语法

 

 

 

1、原始表

CREATE TABLE [dbo].[BASE_UserInDept](
    [HospitalID] [int] NOT NULL,
    [UserID] [int] NOT NULL,
    [DeptCode] [varchar](10) NOT NULL,
    [RoleID] [int] NOT NULL
) ON [PRIMARY]　　
GO

2、可以在建表的时候添加主键

CREATE TABLE [dbo].[BASE_UserInDept](
 [HospitalID] [int] NOT NULL,
 [UserID] [int] NOT NULL,
 [DeptCode] [varchar](10) NOT NULL,
 [RoleID] [int] NOT NULL,
--添加主键约束
 CONSTRAINT [PK_BASE_UserInDept] PRIMARY KEY CLUSTERED 
(
 [HospitalID] ASC,
 [UserID] ASC,
 [DeptCode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

--添加主键DF_BASE_UserInDept默认约束

ALTER TABLE [dbo].[BASE_UserInDept] ADD  CONSTRAINT [DF_BASE_UserInDept]  DEFAULT ((0)) FOR [RoleID]
GO

 3、也可以直接使用

ALTER TABLE table ADD CONSTRAINT 键名 PRIMARY KEY ...添加

ALTER TABLE [dbo].[BASE_UserInDept] ADD  CONSTRAINT [PK_BASE_UserInDept] PRIMARY KEY CLUSTERED 
(
 [HospitalID] ASC,
 [UserID] ASC,
 [DeptCode] ASC
)ON [PRIMARY]

4、清空表数据语法

TRUNCATE TABLE name