SQL Server: ALTER TABLE Customer DROP COLUMN Birth_Date;Oracle: ALTER TABLE Customer DROP COLUMN Birth_Date;Google BigQuery: ALTER TABLE Customer DROP COLUMN Birth_Date;The resulting table structure is: Tabl
会员中心 VIP福利社 VIP免费专区 VIP专属特权 客户端 登录 百度文库 其他 alter table emp remove addcolumn能够删除一列alter table emp remove addcolumn能够删除一列 A. 正确 B. 错误 答案: B©2022 Baidu |由 百度智能云 提供计算服务 | 使用百度前必读 | 文库协议 | 网站地图 | 百度营销 ...
alter table emp drop column addcolumn C. alter table emp delete column addcolumn D. alter table E. mp delete addcolumn 答案 B相关推荐 1以下能够删除一列的是( ) A. alter table emp remove addcolumn B. alter table emp drop column addcolumn C. alter table emp delete column addcolumn D. ...
Assume we want to drop the UNIQUE constraint on the "Address" column, and the name of the constraint is "Con_First." To do this, we type in the following: MySQL: ALTER TABLE Customer DROP INDEX Con_First;Note that MySQL uses DROP INDEX for index-type constraints such as UNIQUE. ...
AlterAvailabilityGroupStatementType AlterBrokerPriorityStatement AlterCertificateStatement AlterCertificateStatementKind AlterColumnAlterFullTextIndexAction AlterColumnEncryptionKeyStatement AlterCreateEndpointStatementBase AlterCreateServiceStatementBase AlterCredentialStatement AlterCryptographicProviderStatement ...
...UNDO中,因此不能通过flashback table操作将表恢复到列删除前的状态, flashback TABLE t_flash_01 TO timestamp (SYSTIMESTAMP - INTERVAL...可以在删除列的操作中增加UNUSED参数,即仅标记列为未使用,数据块保留原值,这就给数据恢复提供了可能, ALTER TABLE t_flash_01 SET unused COLUMN c2; 我们可以...
百度试题 题目下列能够删除一列的是() A.alter table emp remove columnB.alter table emp drop columnC.alter table emp delete columnD.alter table emp delete and drop addcolumn相关知识点: 试题来源: 解析 B 反馈 收藏
在MYSQL数据库中以下能够删除一列的是()A.alter table emp remove addcolumnB.alter table emp drop column
AlterServerRoleStatement 类 AlterServiceMasterKeyOption 枚举 AlterServiceMasterKeyStatement 类 AlterServiceStatement 类 AlterSymmetricKeyStatement 类 AlterTableAddTableElementStatement 类 AlterTableAlterColumnOption 枚举 AlterTableAlterColumnStatement 类 AlterTableChangeTrackingModificationStatement 类 AlterTableConstrain...
EXEC(@sql) ALTER TABLE #test DROP column id EXEC tempdb.sys.sp_rename '#test.new_id', 'id', 'COLUMN' ALTER TABLE #test ADD CONSTRAINT PK_test PRIMARY KEY(id) Since I created the example for a #temp table, everything that references tempdb in that script must be changed to your da...