将上述步骤整合在一起,你可以得到以下 SQL 代码: -- 创建一个名为 Employees 的表CREATETABLEEmployees(EmployeeIDINTPRIMARYKEY,FirstName NVARCHAR(50),LastName NVARCHAR(50),JoiningDateDATE);-- 为 JoiningDate 列添加默认约束,默认值为当前日期ALTERTABLEEmployeesADDCONSTRAINTDF_JoiningDateDEFAULTGETDATE()FORJoi...
How to Use Constraints in SQL Server Like a Pro Create Unique Key Constraint Through GUI In SQL ServerPrakashkumar Sahoo With a passion for crafting innovative solutions, I am a seasoned Dot Net Core Developer specializing in a wide array of technologies. My skill set encompasses C#, jQuery,...
Name Gets or sets the default constraint name. (覆盖 NamedSmoObject. . :: . .Name。) ObjectInSpace 获取Boolean 属性值,该值指定对象是否单独存在,或者对象是否直接或间接连接到 SQL Server 的实例。 (从 SqlSmoObject 继承。) Parent Gets the Column object that is the parent of the DefaultConstrai...
The following example returns the definition of the DEFAULT constraint that is applied to the VacationHours column of the HumanResources.Employee table.Copy USE AdventureWorks2022; GO SELECT d.definition FROM sys.default_constraints AS d INNER JOIN sys.columns AS c ON d.parent_object_id =...
TSqlParserToken TSqlScript TSqlStatement TSqlStatementSnippet TSqlTokenType TSqlTriggerEventGroupHelper TSqlTriggerEventTypeHelper UnaryExpression UnaryExpressionType UniqueConstraintDefinition UniqueRowFilter UnpivotedTableReference UnqualifiedJoin UnqualifiedJoinType UpdateCall UpdateDeleteSpecificationBase...
Ordered byschema, table name, constraint type Sample results QueryColumnsRowsSample results Confused about your SQL Server database? You don't have to be. There's an easy way to understand the data in your databases. I want to understand...
Package: Microsoft.SqlServer.SqlManagementObjects v160.2004021.0 Instance class encapsulating : Server[@Name='']/Database/Table/Column/Default C# コピー [Microsoft.SqlServer.Management.Sdk.Sfc.Metadata.SfcElementType("Default")] public sealed class DefaultConstraint : Microsoft.SqlServer.Management.Smo...
When you try to add a column to a columnstore index that uses a non-runtime-constant in a default constant in SQL Server 2016, you receive an error message that resembles the following: Incorrect synt...
fails because the default constraint hasn't been removed. When you use the visual data tools in SQL Server to remove the column, that's all taken care of for you, but when you're writing your own T-SQL, this can be a stumbling block. Unfortunately, the name of the column default con...
Constraint)、缺省约束(Default Constraint)和空值约束(Not Null Constraint)。一8.2.1PRlMARY KEY约束 PRIMARY KEY约 … book.beifabook.com|基于169个网页 3. 默认值约束 SQL Server及数据库应用1... ... 唯一性约束( Unique Constraint)默认值约束(Default Constraint) 3-5 结构化查询语言( SQ… ...