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本帖最后由 yobyin 于 2010-06-22 22:08 編輯
搞幾個變態(tài)的報表...把多行轉(zhuǎn)成一行，按一個column的排序后取前30%名
多行轉(zhuǎn)一行
CREATE TABLE t_row_str(
ID INT,
col VARCHAR2(10));
INSERT INTO t_row_str VALUES(1,'a');
INSERT INTO t_row_str VALUES(1,'b');
INSERT INTO t_row_str VALUES(1,'c');
INSERT INTO t_row_str VALUES(2,'a');
INSERT INTO t_row_str VALUES(2,'d');
INSERT INTO t_row_str VALUES(2,'e');
INSERT INTO t_row_str VALUES(3,'c');
COMMIT;
SELECT * FROM t_row_str;
5.1
MAX + DECODE
適用范圍：8i,9i,10g及以后版本
SELECT id,
MAX(decode(rn, 1, col, NULL)) ||
MAX(decode(rn, 2, ',' || col, NULL)) ||
MAX(decode(rn, 3, ',' || col, NULL)) str
FROM (SELECT id,
col,
row_number() over(PARTITION BY id ORDER BY col) AS rn
FROM t_row_str) t
GROUP BY id
ORDER BY 1;
5.2
ROW_NUMBER + LEAD
適用范圍：8i,9i,10g及以后版本
SELECT id, str
FROM (SELECT id,
row_number() over(PARTITION BY id ORDER BY col) AS rn,
col || lead(',' || col, 1) over(PARTITION BY id ORDER BY col) ||
lead(',' || col, 2) over(PARTITION BY id ORDER BY col) ||
lead(',' || col, 3) over(PARTITION BY id ORDER BY col) AS str
FROM t_row_str)
WHERE rn = 1
ORDER BY 1;
5.3
MODEL
適用范圍：10g及以后版本
SELECT id, substr(str, 2) str FROM t_row_str
MODEL
RETURN UPDATED ROWS
PARTITION BY(ID)
DIMENSION BY(row_number() over(PARTITION BY ID ORDER BY col) AS rn)
MEASURES (CAST(col AS VARCHAR2(20)) AS str)
RULES UPSERT
ITERATE(3) UNTIL( presentv(str[iteration_number+2],1,0)=0)
(str[0] = str[0] || ',' || str[iteration_number+1])
ORDER BY 1;
5.4
SYS_CONNECT_BY_PATH
適用范圍：8i,9i,10g及以后版本
SELECT t.id id, MAX(substr(sys_connect_by_path(t.col, ','), 2)) str
FROM (SELECT id, col, row_number() over(PARTITION BY id ORDER BY col) rn
FROM t_row_str) t
START WITH rn = 1
CONNECT BY rn = PRIOR rn + 1
AND id = PRIOR id
GROUP BY t.id;
適用范圍：10g及以后版本
SELECT t.id id, substr(sys_connect_by_path(t.col, ','), 2) str
FROM (SELECT id, col, row_number() over(PARTITION BY id ORDER BY col) rn
FROM t_row_str) t
WHERE connect_by_isleaf = 1
START WITH rn = 1
CONNECT BY rn = PRIOR rn + 1
AND id = PRIOR id;
5.5
WMSYS.WM_CONCAT
適用范圍：10g及以后版本
這個函數(shù)預(yù)定義按','分隔字符串，若要用其他符號分隔可以用，replace將','替換。
SELECT id, REPLACE(wmsys.wm_concat(col), ',', '/') str
FROM t_row_str
GROUP BY id;
------------------取按列排名的指定記錄
select * from (
select t.*,cume_dist() over(order by t.score) cume_dist
from testtable t)
where cume_dist>=0.1 and cume_dist<=0.5 ;
oracle 分析function nb
select * from (
select t.*,cume_dist() over(order by t.score) cume_dist
from testtable t)
where cume_dist>=0.1 and cume_dist<=0.5 ; |
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免費注冊
發(fā)表于 2010-06-21 20:20
發(fā)表于 2010-06-22 08:50
華為上研中心 就搞這個啊 ·
