表から過去のデータを取り出す方法の詳細は、「SELECT」の「flashback_query_clause」を参照してください。 FLASHBACK TABLE文を使用する方法の詳細は、『Oracle Databaseバックアップおよびリカバリ・ユーザーズ・ガイド』を参照してください。 前提...
DROPSEQUENCEschema_name.sequence_name;Code language:SQL (Structured Query Language)(sql) In this syntax, specify the name of the sequence that you want to remove after theDROP SEQUENCEkeywords. If you don’t specify the schema to which the sequence belongs, Oracle will remove the sequence in ...
In schema I have included drop query also. But I want to do some improvements for DROP QUERY. So I want to check the existence of db objects before running drop query and drop only when if it exists. I googled for it and found some oracle link, Some link suggest following syntax and...
Thetable_collection_expressionlets you inform Oracle that the value ofcollection_expressionshould be treated as a table for purposes of query and DML operations. Thecollection_expressioncan be a subquery, a column, a built-in function, or a collection constructor. Regardless of its form, it must...
Oracle Drop User statement delete user from the database and remove all objects owned by the schema. This query will also remove user and contents i.e,
7 如果没有人可以帮忙对应数据与表之间的关系，则可以考虑使用如下的手段：由于此例子中仅仅是DROP了TABLESPACE表空间，而数据库本身完全是可用的，则此时可以利用FLASHBACK QUERY来获得DATA_OBJECT_ID与表名之间的映射关系。SQL> select count(*) from sys.obj$; COUNT(*)--- 75436SQL> select count(*) from ...
The nickname must be listed in the catalog (SQLSTATE 42704). The nickname is deleted from the database. All information about the columns and indexes associated with the nickname is deleted from the catalog. Any materialized query tables that are dependent on the nickname are dropped. Any ...
DROPTABLEcarspurge;Code language:SQL (Structured Query Language)(sql) Drop multiple tables at once Oracle provides no direct way to drop multiple tables at once. However, you can use the following PL/SQL block to do it: BEGINFORrecIN(SELECTtable_nameFROMall_tablesWHEREtable_nameLIKE'TEST_%'...
3. Oracle Database invalidates, but does not drop, the following objects in other schemas: 删除用户时,下列在其他用户中的objects不会被删除,只会被置为无效 3.1 Views or synonyms for objects in the dropped user's schema 视图,同义词 3.2 Stored procedures, functions, or packages that query object...
If you know that the employees table has been dropped multiple times, and you want to retrieve the oldest version, then query theUSER_RECYLEBINtable to determine the system-generated name, and then use that name in theFLASHBACKTABLEstatement. (System-generated names in your database will diffe...