CREATE TABLE 语句用于创建新的数据库表,定义表的结构和列。例如,CREATE TABLE Employees (EmployeeID INT, FirstName VARCHAR(50), LastName VARCHAR(50));用于创建名为 "Employees" 的新表。 ALTER TABLE:用于修改表。ALTER TABLE 语句用于修改现有表的结构,例如添加、删除或修改列。例如,ALTER TABLE Customers ...
CREATE DATABASE 语句用于创建新的数据库。例如,CREATE DATABASE MyDatabase; 用于创建名为 "MyDatabase" 的新数据库。 ALTER DATABASE:用于修改数据库。ALTER DATABASE 语句用于修改数据库的属性。例如,ALTER DATABASE MyDatabase SET READ_ONLY; 用于将数据库 "MyDatabase" 设置为只读模式。 CREATE TABLE:用于...
Connect to a SQL Server instance Create a database Create a table Show 4 more Applies to: SQL Server Get started using SQL Server Management Studio (SSMS) to connect to your SQL Server instance and run some Transact-SQL (T-SQL) commands. Note While Microsoft Entra ID is the new nam...
将以下 T-SQL 代码片段粘贴到查询窗口中: SQL USE[TutorialDB]-- Create a new table called 'Customers' in schema 'dbo'-- Drop the table if it already existsIFOBJECT_ID('dbo.Customers','U')ISNOTNULLDROPTABLEdbo.CustomersGO-- Create the table in the specified schemaCREATETABLEdbo.Customers ...
Create a database Create a table Insert and update data in a table Show 3 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Analytics Platform System (PDW) SQL database in Microsoft Fabric Note The Get Started Querying with Transact-SQL learning path provides more...
For more information, see WITH common_table_expression. NO_PERFORMANCE_SPOOL Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (except for the plans when spool is required to guarantee ...
SQL Copy IF OBJECT_ID ( 'dbo.SpatialTable', 'U' ) IS NOT NULL DROP TABLE dbo.SpatialTable; GO CREATE TABLE SpatialTable ( id int IDENTITY (1,1), GeogCol1 geography, GeogCol2 AS GeogCol1.STAsText() ); GO INSERT INTO SpatialTable (GeogCol1) VALUES (geography::STGeomFromText('LINE...
For more information, seeWITH common_table_expression. NO_PERFORMANCE_SPOOL Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (excep...
注意:虽然索引视图是在SQL Server 2000中已经加入,但只有SQL Serer 2008的企业版才支持索引视图的匹配。 我们看一个例子: Create table Table1(id int primary key ,submitdate datetime,commment nvarchar(200));Create table Table2(id int primary key identity,commentid int ,product nvarchar(200));insert...
Create a database Create a table 显示另外 4 个 Applies to:SQL Server Get started using SQL Server Management Studio (SSMS) to connect to your SQL Server instance and run some Transact-SQL (T-SQL) commands. 备注 While Microsoft Entra ID is thenew name for Azure Active Directory (Azure AD...