Comments on: How to return rows in a random order http://oraqa.com/2006/01/27/how-to-return-rows-in-a-random-order/ Oracle Question and Answer Tue, 06 Jan 2009 15:08:16 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Francois Degrelle http://oraqa.com/2006/01/27/how-to-return-rows-in-a-random-order/comment-page-1/#comment-96 Francois Degrelle Tue, 31 Jan 2006 09:40:06 +0000 http://oraqa.com/2006/01/27/how-to-return-rows-in-a-random-order/#comment-96 With Oracle 10g, you have also the ORA_HASH() function <pre> SELECT * FROM sales WHERE ORA_HASH(cust_id, 9) = 1; PROD_ID CUST_ID TIME_ID C PROMO_ID QUANTITY_SOLD AMOUNT_SOLD ---------- ---------- --------- - ---------- ------------- ----------- 2510 6950 01-FEB-98 S 9999 2 78 9845 9700 04-FEB-98 C 9999 17 561 3445 33530 07-FEB-98 T 9999 2 170 . . . 740 22200 13-NOV-00 S 9999 4 156 9425 4750 29-NOV-00 I 9999 11 979 1675 46750 29-NOV-00 S 9999 19 1121 97 rows selected. </pre> ORA_HASH documentation: http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10759/functions097.htm#SQLRF06313 With Oracle 10g, you have also the ORA_HASH() function

SELECT * FROM sales
   WHERE ORA_HASH(cust_id, 9) = 1;

   PROD_ID    CUST_ID TIME_ID   C   PROMO_ID QUANTITY_SOLD AMOUNT_SOLD
---------- ---------- --------- - ---------- ------------- -----------
      2510       6950 01-FEB-98 S       9999             2          78
      9845       9700 04-FEB-98 C       9999            17         561
      3445      33530 07-FEB-98 T       9999             2         170
. . .
       740      22200 13-NOV-00 S       9999             4         156
      9425       4750 29-NOV-00 I       9999            11         979
      1675      46750 29-NOV-00 S       9999            19        1121
97 rows selected.

ORA_HASH documentation:
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10759/functions097.htm#SQLRF06313

]]> By: Claudiu Ariton http://oraqa.com/2006/01/27/how-to-return-rows-in-a-random-order/comment-page-1/#comment-94 Claudiu Ariton Mon, 30 Jan 2006 15:50:21 +0000 http://oraqa.com/2006/01/27/how-to-return-rows-in-a-random-order/#comment-94 Another way to return a sample set of data (procentual) is select * from TABLE sample (10) select * from TABLE sample (0.1) Best regards, Claudiu Ariton Another way to return a sample set of data (procentual) is

select * from TABLE sample (10)
select * from TABLE sample (0.1)

Best regards,
Claudiu Ariton

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