sql server 建表常用语句 （包括主键，外键 等）

Posted 2022-08-19 jwsoft007

sql server 建表常用语句 （包括主键，外键 等）

USE [YGGL]
GO

if exists(select 1 from sysobjects where name=Salary and type=u)
  DROP TABLE [dbo].[Salary]
GO


CREATE TABLE [dbo].[Salary](
  [EmployeeID] [char](6) NOT NULL PRIMARY KEY,
  [InCome] [float] NOT NULL,
  [OutCome] [float] NULL
)

if exists(select 1 from sysobjects where name= fk_DepartmentID  and xtype= F )
  ALTER TABLE dbo.Employes DROP CONSTRAINT fk_DepartmentID 
 

/****** Object:  Table [dbo].[Departments]    Script Date: 2015/11/11 9:48:06 ******/
if exists(select 1 from sysobjects where name=Departments and type=u)  
  DROP TABLE [dbo].[Departments]
GO

CREATE TABLE [dbo].[Departments](
  [DepartmentID] [char](3) NOT NULL PRIMARY KEY ,
  [DepartmentName] [char](20) NOT NULL,
  [Note] [char](16) NULL,
)

if exists(select 1 from sysobjects where name=Employes and type=u)  
  DROP TABLE [dbo].[Employes]
GO

CREATE TABLE [dbo].[Employes](
  [EmployeeID] [char](6) NOT NULL PRIMARY KEY,
  [Name] [char](10) NOT NULL,
  [Birthday] [datetime] NOT NULL,
  [Sex] [bit] NOT NULL,
  [Address] [char](20) NULL,
  [Zip] [char](6) NULL,
  [PhoneNumber] [char](12) NULL,
  [EmailAddress] [char](30) NULL,
  [DepartmentID] [char](3) NOT NULL
)

ALTER TABLE [dbo].[Employes]  ADD  CONSTRAINT [fk_DepartmentID] FOREIGN KEY([DepartmentID]) 
  REFERENCES [dbo].[Departments] ([DepartmentID])
GO