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1. Ê÷²éѯ
create table tree (
    id number(10) not null primary key,
    name varchar2(100) not null,
    super number(10) not null                // 0 is root
);
-- ´Ó×Óµ½¸¸
select * from tree start with id = ? connect by id = prior super 
-- ´Ó¸¸µ½×Ó
select * from tree start with id = ? connect by prior id = super
-- Õû¿ÃÊ÷
select * from tree start with super = 0 connect by prior id = super
2. ·ÖÒ³²éѯ
select * from ( 
    select my_table.*, rownum  my_rownum from ( 
        select name, birthday from employee order by birthday
    ) my_table where rownum < 120 
) where my_rownum >= 100;
3. ÀÛ¼Ó²éѯ, ÒÔscott.empΪÀý
select empno, ename, sal, sum(sal) over(order by empno) result from emp;
 
     EMPNO ENAME             SAL     RESULT
---------- ---------- ---------- ----------
      7369 SMITH             800        800
      7499 ALLEN   &


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select a.blocks,a.bytes,a.bytes/1024/1024 from user_segments a
where a.segment_name='B_M_DZYH_CUST_SIGN_FACT';
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create table TEST_1228 as select * from user_tables;
insert into TEST_1228  select * from TEST_1228 ;
insert into TEST_1228  select * from TEST_1228 ;
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