这是在UserID列上创建唯一聚集索引的语句。ON［PRIMARY］表示在主文件组上创建索引。［pk＿users］是主键的名称。主键显示创建一个主键约束，culstered指数类型表示一个聚集索引，和IGNORE＿DUP＿KEY＝的影响，当向表中插入数据时，如果遇到用户id的值在表中，insert语句失败，整个insert语句回滚。
这是在userid列上创建一个唯一聚集索引的语句。primary key表明创建的是主键约束，culstered表示索引类型...
建立主键索引,主键一般都是聚集索引(Clustered 代表是聚集索引)(物理存储顺序和排序方式一致)一个表只能有一个聚集索引 asc是按索引字段升序排序。而且指定索引文件位于主文件组on [primary] IGNORE_DUP_KEY 的意思是当往包含一个唯一约束中的列插入重复数据时SqlServer所作的反应,当选择此项时候SqlServer返回一个错误...
Clustered property class of PrimaryKeyConstraint C# 复制 public static Microsoft.SqlServer.Dac.Model.ModelPropertyClass Clustered { get; } Property Value ModelPropertyClass Applies to 产品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 162.2.111 ...
程序集:Microsoft.SqlServer.Dac.Extensions(在 Microsoft.SqlServer.Dac.Extensions.dll 中) 语法 C# publicstaticModelPropertyClass Clustered {get;internalset; } 属性值 类型:Microsoft.SqlServer.Dac.Model.ModelPropertyClass 请参阅 参考 PrimaryKeyConstraint 类 Microsoft.SqlServer.Dac.Model 命名空间...
Changing a primary key clustered index to a non-clustered index Charindex very bad performance Check Actual Error from sp_executesql Check Constraint Across Tables check constraint calls a stored procedure or trigger Check Constraint on decimal: restrict user to enter more than 1 digit Check date ...
CONSTRAINT [PK_Workdays] PRIMARY KEY CLUSTERED ( [CalendarYear], [WorkDate]   ON [PRIMARY] GO ALTER TABLE [dbo].[SchoolServices] WITH NOCHECK ADD CONSTRAINT [IX_SchoolServices] UNIQUE NONCLUSTERED ( [EmployeeID], [School], [ServiceDate], [Counter]   ON [PRIMARY] GO setuser GO...
CarID int not null identity(1,1), VIN varchar(25) unique ); go create unique clustered index CX_Car_CarID on dbo.Car (CarID) with (fillfactor=90); go insert Car select null ___ Need help? Help us help you. Read the article athttp://www.sqlservercentral.com/articles...
CREATETABLE[dbo].[Unit] ( [id]SMALLINTNOTNULLIDENTITY(1,1), [name]VARCHAR(100)NOTNULL,CONSTRAINT[PK_Unit] PRIMARYKEYCLUSTERED ([id]),CONSTRAINT[UQ_Unit_Name]UNIQUE([name]) ) Run Code Online (Sandbox Code Playgroud) 如何在不违反 UNIQUE 约束的情况下允许以下两个字符串共存?
Clustered property class of PrimaryKeyConstraint public static Microsoft.SqlServer.Dac.Model.ModelPropertyClass Clustered { get; } Property Value ModelPropertyClass Applies to 產品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 162.2.111 ...