Oracle中的"AS OF TIMESTAMP"功能 在Oracle数据库中,"AS OF TIMESTAMP"是一个强大的功能,它允许用户查询表在过去某个特定时间点的数据状态。这个功能特别有用于数据恢复、审计或任何需要查看历史数据状态的场景。它依赖于Oracle的Flashback Query技术,通过读取UNDO段中的历史数据来提供过去的数据视图。 如何使用"AS ...
create view hour_ago as select * from employees as of timestamp (systimestamp - interval '60' minute); 1. 二、闪回版本查询(Flashback Version Query) 闪回版本查询用法和闪回查询类似,闪回查询是返回某一时间点的数据状态,而闪回版本查询则是返回一段时间内数据的所有版本。我们可以用select的versions bet...
Oracle AS OF TIMESTAMP用法就是使用Oracle的时间戳技术来访问特定时间之前的数据,或者说把数据库回滚到某个时间点以前的状态.让我们来看一下AS OF TIMESTAMP的语法: SELECT <COLUMNS> FROM <TABLE> AS OF TIMESTAMP <TIMESTAMP>; 参数说明如下: COLUMNS–要查询的列 TABLE–表的名称 TIMESTAMP–时间戳,日期或...
CREATE TABLE [TABLENAME] AS SELECT * FROM (SELECT * FROM [TABLENAME] AS OF TIMESTAMP SYSDATE - 1);
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AS OF TIMESTAMP TO_TIMESTAMP('2012-03-21 07:30:00', 'YYYY-MM-DD HH:MI:SS') WHERE UPPER(last_name) = 'SMITH'; 使用闪回查询恢复数据 INSERT INTO personnel ( SELECT * FROM personnel AS OF TIMESTAMP TO_TIMESTAMP('2012-03-21 07:30:00', 'YYYY-MM-DD HH:MI:SS') ...
Hi! I have a valid Oracle select: SELECT * from FROM test_table AS OF TIMESTAMP (SYSTIMESTAMP);
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SQL> select * from test as of timestamp(systimestamp - interval '10' day); select * from test as of timestamp(systimestamp - interval '10' day) * ERROR at line 1:
出现以下异常的原因是因为同包中有相同的类名了 Error:(73, 12) SensorReading is already defined as case class SensorReading case class SensorReading(id: String, timestamp: Long, temperature: Double) 管用请你点这里... 查看原文 Flink 的时间语义与Wartermark ...