我不知道它是用于Oracle还是MySQL,但它可以做类似的事情: DROP COLUMN xxx CASCADE CONSTRAINTS 它会删除所有相关的约束... 或者至少它会自动删除映射到该列的约束(至少CHECK约束!) 在MSSQL中没有类似的东西吗? 此查询查找给定表的默认约束。它不是很好,我同意: select col.name, col.column_id, col.default_o...
The DROP INDEX statement does not apply to indexes created by defining PRIMARY KEY or UNIQUE constraints (created by using the PRIMARY KEY or UNIQUE options of either the CREATE TABLE or ALTER TABLE statements). For more information about PRIMARY KEY or UNIQUE constraints, see CREATE TABLE (SQL...
DROP RULE 将在SQL Server 的未来版本中删除。 请勿在新开发工作中使用 DROP RULE ,并计划修改当前使用它们的应用程序。 CHECK请改用CHECK可以使用 CREATE TABLE 或 ALTER TABLE 关键字创建的约束。 有关详细信息,请参阅 Unique Constraints and Check Constraints。Transact...
保存 添加到集合 添加到计划 打印 TwitterLinkedInFacebook电子邮件 项目 2015/07/24 本文内容 语法 注释 请参阅 Get or set boolean that specifies whether to drop all constraints that do not exist in the source model. 命名空间:Microsoft.SqlServer.Dac ...
DROP RULE 将在SQL Server 的未来版本中删除。 请勿在新开发工作中使用 DROP RULE ,并计划修改当前使用它们的应用程序。 CHECK请改用CHECK可以使用 CREATE TABLE 或 ALTER TABLE 关键字创建的约束。 有关详细信息,请参阅 Unique Constraints and Check Constraints。Transact...
The code below generates two separate sets of commands: one to drop all foreign key constraints, and one to create them again. These scripts are stored in a table so that, if you drop the constraints and then disaster of some kind strikes during the create, you still have everything h...
SQL Server check constraints system view sys.check_constraints contains all data required to drop and re-create an SQL constraint Transact-SQL programmers can create a stored procedure to find the name of the check constraint using the table name and the column name. Then the constraint name can...
The error message “Could not drop object 'production.brands' because it is referenced by a FOREIGN KEY constraint. (Microsoft SQL Server, Error: 3726)” is telling us why the table cannot be dropped. In this case we would need to step through dropping the constraints then dropping the tabl...
constraints, we first remove the constraint.SQL Serverdoes not drop a column with PRIMARY or FOREIGN KEY constraints or other dependencies. However, we can do this by using the Table Designer. We will first delete all dependencies on the column while using Object Explorer orTransact-SQLto drop...
In SQL Server, you cannot drop a table if it is referenced by a FOREIGN KEY constraint. You have to either drop the child tables before removing the parent table, or remove foreign key constraints. This article provides a Transact-SQL script to drop fo