oracle查询一天前、几天前、几小时前、一小时前的数据以及恢复误删的数据

SELECT * FROM <table_name> AS OF TIMESTAMP (SYSDATE-<interval>);

--一小时是一天的1/24 ，故<interval>参数为1/24，如果想查四小时前的数据，<interval>参数可以是4/24或1/6
SELECT * FROM USER_INFO AS OF TIMESTAMP (SYSDATE-1/24);

SELECT * FROM USER_INFO AS OF TIMESTAMP (SYSDATE-1);

SELECT * FROM USER_INFO AS OF TIMESTAMP (SYSDATE-3);

CREATE TABLE TABNAME_TEMP AS SELECT * FROM TABNAME AS OF TIMESTAMP (SYSDATE-<interval>);

 -- SELECT * FROM TABNAME_TEMP 语句 可以带where条件，看您需要插入所有数据还是选择性插入
 INSERT INTO TABNAME SELECT * FROM TABNAME_TEMP ;

DROP TABLE TABNAME_TEMP;--注意这里删除的是临时表，您刚刚创建的表，别删错了。

CREATE TABLE USER_INFO_TEMP AS SELECT * FROM USER_INFO AS OF TIMESTAMP (SYSDATE-1);
INSERT INTO USER_INFO SELECT * FROM USER_INFO_TEMP where username in ('Tom','Jerry');
DROP TABLE USER_INFO_TEMP;

//一月之内
SELECT * FROM ESS.E_LOG WHERE E_LOG."ETime" BETWEEN sysdate-interval '7' month AND SYSDATE;
 
SELECT * FROM ESS.E_LOG
WHERE to_char(E_LOG."ETime",'yyyy-mm-dd hh24:mi:ss') between to_char(sysdate-225,'yyyy-mm-dd hh24:mi:ss') and to_char(sysdate,'yyyy-mm-dd hh24:mi:ss');
 
//一周之内
select * from ESS.E_LOG where E_LOG."ETime" > sysdate - interval '7' day;
 
 
//一年之内
select count(*) from ESS.E_LOG WHERE E_LOG."ETime" BETWEEN sysdate-interval '1' year AND SYSDATE;
 
//sysdate获取的时间是Oracle数据库系统时间
select sysdate from dual;