简单oracle常用sql操作

select * from tt as of timestamp to_date('2016-2-15 10:07:00','yyyy-MM-dd HH24:mi:ss')     --查询某个时间点的数据
alter table tt enable row movement；--更改行级移动
flashback table tt to timestamp to_date('2016-2-15 10:07:00','yyyy-MM-dd HH24:mi:ss')    --闪回某个时间的数据
flashback table tt to before drop;--回复删除的表

select dbms_flashback.get_system_change_number from dual;         --查看SCN
select timestamp_to_scn(to_date('2015-02-25 08:00:00','yyyy-MM-dd hh24:mi:ss')) from dual;   --时间转SCN
select to_char(scn_to_timestamp(1646776582),'yyyy-MM-dd hh24:mi:ss') from dual;               --SCN转时间
select * from  tt as of scn 1656766582;    --查SCN时间的数据

select split('1,2,3',',') from dual    --split返回Collection
select * from table(split('1,2,3',','))  ---查询Collection

create table user_info(userid number,username varchar2(50));                    --建表
alter table user_info rename column user_id to user_code  --修改表字段名
rename table_user to table_customer   --修改表名
alter table table_user modify user_name varchar(50)  --修改表字段的类型
insert into user_info (userid,username) select t.cusid,t.cusname from cus_info t   --插入一堆数据
insert into user_info (userid,username) values (1,'张三')                          --插入一条数据
update user_info set userid=1,username='李四' where userid=2                      --修改一条数据
update user_info set (userid,username) = (select cusid,cusname from cus_info) where status=0   --修改一堆数据

select * from testT t  connect by prior t.id=t.parent start with t.id=1       --树形查询

drop index tt_index;                                  --删除索引
create index tt_index on tt(tid,tname);    --新建索引

drop sequence tt_seq;     --删除序列
create sequence tt_seq    --创建序列
minvalue 1
maxvalue 100
start with 1
increment by 1
nocache

drop view tt_view;                   --删除视图
create view tt_view as select t.tname from tt t --创建视图

select * from user_tables      --查询当前用户的表
select * from user_sequences   --查询当前用户的序列
select * from user_indexes     --查询当前用户的索引
select * from user_views       --查询当前用户的视图
select * from user_tablespaces --查询当前用户的表空间
select * from user_types       --查询当前用户的type
select * from user_users       --查询当前用户中的用户
select * from user_synonyms    --查询当前用户的同义词
select * from user_jobs        --查询当前用户的job
select * from user_workspaces  --查询当前用户的工作空间

select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;   ---查询表被锁住
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time; ---查询锁表的sid和serial#
alter system kill session'632,53';  ---删除锁表的进程，sid,seria#

select * from v$datafile;   --数据文件
select * from v$controlfile;  --控制文件
select * from v$logfile;    --日志文件

ALTER TABLE table_name ADD CONSTRAINT constraint_name FOREIGN KEY (column_name) REFERENCES table_name2(column_name) ON DELETE CASCADE;  --级联删除
ALTER TABLE table_name ADD CONSTRAINT constraint_name FOREIGN KEY (column_name) REFERENCES table_name2(column_name) ON DELETE SET NULL; --如果被引用的表数据删除，该字段设置为空
ALTER TABLE table_name DROP CONSTRAINT constraint_name;  --删除表约束