该DROP INDEX语句不适用于通过定义PRIMARY KEY或UNIQUE约束创建的索引。 若要删除约束和相应的索引,请使用ALTER TABLE和DROP CONSTRAINT子句。 重要 将在SQL Server 的未来版本中删除定义的<drop_backward_compatible_index>语法。 请避免在新的开发工作中使用该功能,并考虑修改当前使用该功能的应用程序。 请改用在<dro...
語句DROP INDEX不適用於定義 或UNIQUE條件約束所建立的PRIMARY KEY索引。 若要移除條件約束和對應的索引,請使用ALTER TABLE搭配DROP CONSTRAINT子句。 重要 中<drop_backward_compatible_index>定義的語法將會在未來的 SQL Server 版本中移除。 請避免在新的開發工作中使用這個語法,並規劃修改目前在使用這個語法的應用程...
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 ta...
1)NOTNULL,[StatusName] [varchar](50)NULL,CONSTRAINT[PK_EmployeeStatus]PRIMARYKEYCLUSTERED([StatusID])GO-- insert some sample employee status valuesINSERT
Para quitar la restricción y el índice correspondiente, use ALTER TABLE con la cláusula DROP CONSTRAINT.Expandeix la taula Importante La sintaxis definida en <drop_backward_compatible_index> dejará de incluirse en futuras versiones de Microsoft SQL Server. Evite utilizar esta sintaxis en ...
ADD CONSTRAINT PK_Employees PRIMARY KEY (First_Name, Last_Name); GO Drop the Primary Key in SQL Server To Drop the Primary Key, we use the below syntax. It does not matter if the Primary Key was on single or multiple columns.
To remove the constraint and corresponding index, use ALTER TABLE with the DROP CONSTRAINT clause.Važno The syntax defined in <drop_backward_compatible_index> will be removed in a future version of Microsoft SQL Server. Avoid using this syntax in new development work, and plan to modify ...
Expected behavior .dropDefault() drops the default value constraint. Actual behavior .dropDefault() does not drop the default value constraint. Steps to reproduce the problem .dropDefault() does not seem to do anything for me on SQL Serv...
The DROP INDEX statement does not apply to indexes created by defining PRIMARY KEY or UNIQUE constraints. To remove the constraint and corresponding index, useALTER TABLEwith the DROP CONSTRAINT clause. Important The syntax defined in <drop_backward_compatible_index> will be removed in a future ve...
在SQL Server 2008数据库中,使用DDL语言创建数据表的语法结构比较复杂,本书在多个章节分别进行讲解。(1)使用CREATE TABLE创建数据表的语法结构如下所示。CREATE TABLE [ database_name . [ schema_name ] . | schema_name . ] table_name ( { <column_definition>} [ ] [ ,...n ] ) [ ON { partiti...