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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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2009-12-30 15:00
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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';
Ê×ÏÈ
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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select * from t1 where exists ( select null from t2 where y = x )
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for x in ( select * from t1 )
loop
if ( exists ( select null from ......
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TRANSLATE(string,from_str,to_str)
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