要從資料集卸除的指定資料行。 使用方式 複製 dropColumns(vars, ...) 引數 vars 要卸除之變數名稱的字元向量或清單。 ... 傳送至計算引擎的其他引數。 值 定義轉換的 maml 物件。 作者 Microsoft Corporation Microsoft Technical Support意見反應 此頁面對您有幫助嗎? Yes No
It should only be used with SQL Server 2000 (8.x) Publishers and SQL Server 2000 (8.x) republishing Subscribers. This procedure shouldn't be used on columns with data types that were introduced in SQL Server 2005 (9.x) and later versions....
public boolean supportsAlterTableWithDropColumn() 傳回值 如果支援,則為true。 否則為false。 例外狀況 SQLServerException 備註 這個supportsAlterTableWithDropColumn 方法是由 java.sql.DatabaseMetaData 介面中的 supportsAlterTableWithDropColumn 方法指定。
microsoftml.drop_columns(cols: [list, str], **kargs) Description Specified columns to drop from the dataset. Arguments cols A character string or list of the names of the variables to drop. kargs Additional arguments sent to compute engine. Returns An object defining the transform. See als...
droptableTestTable end createtableTestTable ( ColumnAvarchar(50), ColumnBvarchar(50) ) 1. 2. 3. 4. 5. 6. 7. 8. 9. 2.为ColumnA列添加注释: exec sp_addextendedproperty @name=N'MS_Description', @value=N'列A的注释', @level0type=N'SCHEMA', ...
以下示例删除视图 Reorder。 SQL 复制 DROP VIEW IF EXISTS dbo.Reorder ; GO 另请参阅 ALTER VIEW (Transact-SQL) CREATE VIEW (Transact-SQL) EVENTDATA (Transact-SQL) sys.columns (Transact-SQL) sys.objects (Transact-SQL) USE (Transact-SQL) sys.sql_expression_dependencies (Transact-SQL)反馈...
3.查看结果: 或者执行sql语句: select col.Name,ext.value from sys.extended_properties ext inner join sys.columns col on ext.major_id=col.object_id and ext.minor_id=col.column_id where ext.major_id=object_id('TestTable') 结果:分类: 工作记录 标签: DB, SQL 好文要顶 关注我 收藏该文 微...
FROMcustomers; ALTER TABLE TheALTER TABLEcommand adds, deletes, or modifies columns in a table. TheALTER TABLEcommand also adds and deletes various constraints in a table. The following SQL adds an "Email" column to the "Customers" table: ...
表中的数据库对象包含列、索引和触发器。 列(Columns):也称属性列,在具体创建表时,必须制定列的名字和数据类型。 索引(Indexes):是指根据制定的数据库表列建立起来的顺序,提供了快速访问数据的途径。且可监督表的数据,使其索引指向的列的数据不重复; 触发器(trigger ...
After a rule is dropped, new data entered into the columns previously governed by the rule is entered without the constraints of the rule. Existing data isn't affected in any way. The DROP RULE statement doesn't apply to CHECK constraints. For more information about dropping CHECK constraints...