ALTER TABLE table_name ADD CONSTRAINT constraint_name constraint_type (column_name); ALTER TABLE table_name ENABLE/DISABLE TRIGGER trigger_name; 在PostgreSQL中,ALTER命令也提供了类似的功能,并且还允许重命名列: ALTER TABLE table_name RENAME COLUMN old_column_name TO new_column_name; 这些命令使数据库...
ALTER TABLE HumanResources.EmployeeDepartmentHistory CHECK CONSTRAINT FK_EmployeeDepartmentHistory_Department_DepartmentID; GO H. 重新生成已分区索引 下面的示例在 5 数据库中重新生成一个分区索引为 IX_TransactionHistory_TransactionDate 的分区,分区号为 AdventureWorks2022。 分区 5 是使用 ONLINE=ON 重新生成的...
ALTER TABLE HumanResources.EmployeeDepartmentHistory CHECK CONSTRAINT FK_EmployeeDepartmentHistory_Department_DepartmentID; GO H. 重建資料分割索引 下列範例會重建 5 資料庫中分割區索引 IX_TransactionHistory_TransactionDate 的單一分割區,分割區編號是 AdventureWorks2022。 分割區 5 在 ONLINE=ON 重建,而且低優先...
The PRIMARY KEY constraint in the user table can't be modified while a spatial index is defined on a column of that table. To change the PRIMARY KEY constraint, first drop every spatial index of the table. After modifying the PRIMARY KEY constraint, you can re-create each of the spatial...
ALTER TABLE stu ADD CONSTRAINT DF_class DEFAULT('班级不详')提示是:“约束 'TABLE' 的定义中有语法错误。” 答案 ALTER TABLE stu ADD CONSTRAINT DF_class DEFAULT('班级不详') for 添加默认值的字段名相关推荐 1sql server 2008语句,提示有错误为什么?ALTER TABLE stu ADD CONSTRAINT DF_class DEFAULT('...
syntaxsql Copy -- Syntax for Warehouse in Microsoft Fabric ALTER TABLE { database_name.schema_name.source_table_name | schema_name.source_table_name | source_table_name } { ADD { <column_constraint> FOR column_name} [ ,...n ] | DROP { [CONSTRAINT] constraint_name } [ ,...n ]...
SERVER ROLE SERVICE CLAVE MAESTRA DE SERVICIO SYMMETRIC KEY TABLE TABLE column_constraint TABLE column_definition TABLE computed_column_definition TABLE index_option TABLE table_constraint TRIGGER USER VIEW WORKLOAD GROUP XML SCHEMA COLLECTION Copia de seguridad y restauración CREATE Intercalaciones DROP ...
syntaxsql Kopieren -- Syntax for Warehouse om Microsoft Fabric: ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ADD { column_name <data_type> [COLLATE collation_name] [ <column_options> ] } [ ,...n ] | ADD { <column_constraint> FOR...
SORT_IN_TEMPDB 和 MAXDOP 是重新生成单个分区 (PARTITION =n) 时可指定的选项。不能在单个分区重新生成操作中指定 XML 索引。 不能在线重新生成分区索引。在此操作过程中将锁定整个表。 DISABLE 将索引标记为已禁用,从而不能由 SQL Server 2005 数据库引擎使用。任何索引均可被禁用。已禁用的索引的索引定义保留...
You cannot create a table constraint as part of a CREATE TABLE...AS FILETABLE statement. However you can add the constraint later by using an ALTER TABLE statement. You cannot create a FileTable in the tempdb database or in any of the other system databases. You cannot create a FileTable...