CREATE TABLE test( ob_id VARCHAR(32), ob_name VARCHAR(32) );
INSERT INTO test VALUES('A001','A001-a'); INSERT INTO test VALUES('A001','A001-b'); INSERT INTO test VALUES('A001','A001-c'); INSERT INTO test VALUES('A001','A001-d'); INSERT INTO test VALUES('A002','A002-a'); INSERT INTO test VALUES('A002','A002-b'); INSERT INTO test VALUES('A002','A002-c'); INSERT INTO test VALUES('A002','A002-d'); COMMIT; 查询结果:
OB_ID |
OB_NAME |
A001 |
A001-a |
A001 |
A001-b |
A001 |
A001-c |
A001 |
A001-d |
A002 |
A002-a |
A002 |
A002-b |
A002 |
A002-c |
A002 |
A002-d |
如何实现下面的查询结果:
OB_ID |
OB_NAME |
A001 |
A001-a |
|
A001-b |
|
A001-c |
|
A001-d |
A002 |
A002-a |
|
A002-b |
|
A002-c |
|
A002-d |
方法一: select decode(rownum,1,ob_id,5,ob_id) ob_id,ob_name from test;
方法二: select decode(row_number() over(partition by ob_id order by ob_name),1,ob_id) ob_id,ob_name from test t;
方法三: select decode(lag(ob_id) over(partition by ob_id order by ob_name), ob_id, null, ob_name) ob_id,ob_name from test;
方法四: SELECT CASE WHEN m.rn=m.rn1 THEN NULL ELSE m.ob_id END ob_id, m.ob_name FROM (SELECT d.ob_id,d.ob_name,rn,LAG(d.rn) OVER(ORDER BY d.ob_id) rn1 FROM (SELECT t.ob_id,t.ob_name,dense_RANK() OVER( ORDER BY t.ob_id) rn FROM TEST t) d) m;
方法五: select decode(t1.ob_name, v.name, t1.ob_id, ''), t1.ob_name from (select * from test t where rowid in (select min(rowid) from test group by ob_id,ob_name)) t1 join (select t.ob_id id, min(t.ob_name) name from test t group by t.ob_id) v on v.id = t1.ob_id order by t1.ob_id, t1.ob_name;
方法六:
在sqlplus中 break on ob_id skip select * from test; |
来自:
http://www.itpub.net/thread-1768915-1-1.html
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