You can do so with an alter table drop command:Copy code snippet Copied to Clipboard Error: Could not Copy Copied to Clipboard Error: Could not Copy alter table toys drop ( weight );But beware!This is an expensive operation. On tables storing millions of rows it will take a long time...
TheDROP TABLEcommand deletes a table in the database. The following SQL deletes the table "Shippers": Example DROPTABLEShippers; Try it Yourself » Note:Be careful before deleting a table. Deleting a table results in loss of all information stored in the table!
4. 修改:创建(Create), 修改(Alter),删除(Drop)模式对象. 对表(Table),索引(Index),聚簇(Cluster)进行分析(Analyze). 加注释(Comments)到数据字典; alter 双语例句 1. The optical energy leaking out from the fibre is absorbed by the metallic coating, which raise the temperature and alter the grating...
AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableD...
使用ALTER TABLE指令來變更現有表格及其直欄的性質。 您可以新增、捨棄及變更直欄,並手動設定INCR類型的欄位值。 限制:您無法變更系統表格。 語法 ALTER TABLE [database_name.]table_nameSET INCRvalueADD [COLUMN]column_namedata_type[ NODEFAULT | NOMODIFY | HIDDEN ] DROP [COLUMN]column_nameALTER [COLUMN...
] table_name { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] | max | xml_schema_collection } ) ] [ COLLATE collation_name ] [ NULL | NOT NULL ] [ SPARSE ] | {ADD | DROP } { ROWGUIDCOL | PERSISTED | NOT FOR REPLICATION | SPARSE ...
AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableDropTableElement 建構函式 屬性 DropClusteredConstraint...
The ALTER TABLESPACE statement is used to modify an existing table space. You can modify a table space in the following ways: Add a container to, or drop a container from a DMS table space; that is, a table space created with the MANAGED BY DATABASE option. Modify the size of a con...
使用ALTER TABLE 从数据表中 删除约束 的基本语法如下:ALTER TABLE table_name DROP CONSTRAINT MyUniqueConstraint;如果你在使用 MySQL,代码应当如下:ALTER TABLE table_name DROP INDEX MyUniqueConstraint;使用ALTER TABLE 从数据表中 删除主键约束 的基本语法如下:...
FILESTREAM, FileTable & BLOB Overview FILESTREAM FileTables Prerequisites Create, Alter, & Drop Load Files Directories & Paths Access with T-SQL Access with File Input-Output APIs Manage Schema Interoperability DDL, Functions, Stored Procedures, & Views ...