在SQL Server中,如果要删除表中的列,可以使用ALTER TABLE语句的DROP COLUMN子句。具体步骤如下: 1. 首先,确保你有足够的权限来执行此操作。通常,只有数据库管理员或具有...
DROP TABLE IF EXISTS dbo.DropColumnTest; GO CREATE TABLE dbo.DropColumnTest ( rid int NOT NULL CONSTRAINT DropColumnTest_pkc PRIMARY KEY CLUSTERED , someCol varchar(8000) NOT NULL ); INSERT INTO dbo.DropColumnTest (rid, someCol) SELECT 1, REPLICATE('Z', 8000); GO DECLARE @...
If you delete all rows in a table by using theDELETEstatement or use theTRUNCATE TABLEstatement, the table definition exists until it's dropped usingDROP TABLE. If you drop a table that contains avarbinary(max)column with theFILESTREAMattribute, any data stored in the file system isn't remov...
實作 IDroppable. . :: . .Drop() () () ()備註 [!附註] Columns based on the UserDefinedTableType object cannot be modified and this method generates an exception.範例 使用資料庫物件請參閱 參考 Column 類別 Microsoft.SqlServer.Management.Smo 命名空間 其他資源 ALTER TABLE (Transact-SQL) 中...
检索此数据库是否支持带有删除列的 ALTER TABLE。 语法 复制 public boolean supportsAlterTableWithDropColumn() 返回值 如果支持,则值为 true。 否则为 false。 例外 SQLServerException 备注 此supportsAlterTableWithDropColumn 方法是由 java.sql.DatabaseMetaData 接口中的...
syntaxsql 複製 sp_repldropcolumn [ @source_object = ] N'source_object' , [ @column = ] N'column' [ , [ @from_agent = ] from_agent ] [ , [ @schema_change_script = ] N'schema_change_script' ] [ , [ @force_invalidate_snapshot = ] force_invalidate_snapshot ] [ , [ @...
[owner_name. ]table_or_view_name.index_name<object>::={database_name.schema_name.table_or_view_name|schema_name.table_or_view_name|table_or_view_name}<drop_clustered_index_option>::={MAXDOP=max_degree_of_parallelism|ONLINE= {ON|OFF} |MOVETO{partition_scheme_name(column_name) |...
If you drop a table that contains a VARBINARY(MAX) column with the FILESTREAM attribute, any data stored in the file system will not be removed.When a ledger table is dropped, its dependent objects (the history table and the ledger view) are also dropped. A history table or a ledger ...
SQL Server / Oracle / MS Access: ALTERTABLEPersons ALTERCOLUMNCityDROPDEFAULT; MySQL: ALTERTABLEPersons ALTERCityDROPDEFAULT; DROP INDEX TheDROP INDEXcommand is used to delete an index in a table. MS Access: DROPINDEXindex_nameONtable_name; ...
nameRESTRICTSERVERserver-nameservice-class-designatorRESTRICTSTOGROUPstoragegroup-nameRESTRICTTABLEtable-name2TABLE HIERARCHYroot-table-name,tablespace-nameTRANSFORMALLgroup-nameFORtype-nameTHRESHOLDthreshold-nameTRIGGERtrigger-nameTRUSTED CONTEXTcontext-nameTYPEtype-nameRESTRICTTYPE MAPPINGtype-mapping-nameUSAGE LIST...