Example to drop a single column:ALTER TABLE Customer UNUSED (Age);Result:Example to drop Multiple column:ALTER TABLE Customer UNUSED (Age, Address, Country);Result:How to DROP columns from an existing table in
在Oracle中删除字段需要使用ALTER TABLE语句结合DROP COLUMN选项。具体说明如下：Oracle字段删除操作：当Oracle数据库中的表需要删除某个字段时，应使用SQL语句进行操作。使用ALTER TABLE语句：修改Oracle表结构的主要方法是使用ALTER TABLE语句。通过这条语句，可以实现对表中字段的添加、删除或修改。结合DROP CO...
alter table pyramid.test_alter2 drop column name; 我的跟踪步骤如下: 13:44:18 sys@DSEDI>select * from v$mystat where rownum<2 ; SID STATISTIC# VALUE --- --- --- 166 0 0 13:44:31 sys@DSEDI>alter table pyramid.test_alter2 drop column name; 这个语句卡死 在新的会话查看非空闲等待...
这个操作在间隔分区上执行会命中BUG:20598042,ALTER TABLE DROP COLUMN … CHECKPOINT on an INTERVAL PARTITIONED table fails with ORA-600 [17016] 执行结果是: drop column checkpoint操作会报ORA-600[17016]错误; 插入和查询操作,在drop过程以及drop报错之后,均抛出ORA-12986异常; 在打补丁修复bug之前,这个表将...
You need to identify and drop the secondary objects: 你需要找出并删除二级对象: 1.The domain index associated with a table in the tablespace to be dropped can be identified from the following query: 要删除的与在这个表空间中的表相关的域索引可以通过下面的查询找出来: 代码语言:javascript 代码运行...
DROP TABLE brands CASCADE CONSTRAINTS;Code language: SQL (Structured Query Language) (sql) This statement drops the brands table and the foreign key constraint fk_brand from the cars table. Oracle DROP TABLE PURGE Statement example The following statement drops the cars table using the PURGE clau...
25、select * from dba_tablespaces//查询表空间存储参数 26、select t.table_name,t.initial_extent,t.next_extent,t.min_extents,t.max_extents,t.pct_increase from user_tables t select b.segment_name,b.tablespace_name,b.extent_id,b.extent_id,b.bytes,b.blocks from user_extents b ...
From Oracle Ver. 8i you can drop columns directly it was not possible in previous versions.For example to drop PIN, CITY columns from emp table. alter table emp drop column (pin, city);Remember you cannot drop the column if the table is having only one column....
Simply drag-and-drop a field from one area of a pivot table to another in order to design its layout and rearrange their data the way you need. You can easily swap row and column fields to display row field values in columns and column field values in rows. ...
SQL>drop user username cascade; (删除与用户相关的所有对象) 这样该用户包括该用户下的表,试图,同义词,过程,索引,及相关的一切就删除了。 创建用户并赋权限以及设置默认表空间。 以sysdba用户登陆进行以下设置: -- Create the user create user VHFSM ...