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...
SQL Server: ALTERTABLEPersons ADDCONSTRAINTdf_City DEFAULT'Sandnes'FOR City; MS Access: ALTERTABLEPersons ALTERCOLUMNCitySETDEFAULT'Sandnes'; Oracle: ALTERTABLEPersons MODIFYCityDEFAULT'Sandnes'; DROP a DEFAULT Constraint To drop aDEFAULTconstraint, use the following SQL: ...
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 visibility of the metadata in catalog views is limited to securables that a user either owns, or on which the user was granted some permission. For more information, see Metadata Visibility Configuration. Examples The following example returns the definition of the DEFAULT constraint that...
生成SQL 片段以删除列的默认约束。 C# 复制 protected virtual void DropDefaultConstraint(string? schema, string tableName, string columnName, Microsoft.EntityFrameworkCore.Migrations.MigrationCommandListBuilder builder); 参数 schema String 包含表的架构。 tableName String 包含列的表...
An expression can't be used with a default constraint.PermissionsThe actions described in this article require ALTER permission on the table.Use SQL Server Management Studio to specify a defaultYou can use Object Explorer in SSMS to specify a default value for a table column. To do so, ...
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...
where exec('alter table [dbo].[Test] add constraint ' + @csname + ' Default((18)) for age')。注意：默认值约束，不能修改。必须先drop之后再add drop的时候，必须知道当前“默认值约束的名称”。通过上面的sql可以查出Test表的age字段所绑定的“默认值约束名称”，才可以drop。
ADD CONSTRAINT df_emp_hired DEFAULT 'Hired' FOR employment_status; This command adds a new constraint called df_emp_hired which ensures the default value of the employment_status column is ‘Hired’. Remove the Default To remove the default from a column in SQL Server: ...
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… ...