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Pls. help. Why have no output. (order by) [message #333221]

Thu, 10 July 2008 21:40

hareluya_17
Messages: 2
Registered: July 2008
Location: Bangkok, Thailand

Junior Member

I want to show top ten and order by SPT_BCCY desc.
I use asc ,that show ascending order.

SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT,
SHAPE_DESC, COLOR, SPT_BCCY
FROM (SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT,
SHAPE_DESC, COLOR, SPT_BCCY FROM V_TXN_LIST
ORDER BY SPT_BCCY asc)
WHERE ROWNUM <= 10;

result
Item_code...Item_des...Category... Cut...Shape_desc...Color ...Spt_bccy
xxxx..............xxxx............xxxx ..........xx......xxxx................xx ........5.5
xxxx..............xxxx............xxxx ..........xx......xxxx................xx ........11
xxxx..............xxxx............xxxx ..........xx......xxxx................xx ........13
xxxx..............xxxx............xxxx ..........xx......xxxx................xx ........16
xxxx..............xxxx............xxxx ..........xx......xxxx................xx ........22
......

But I use descending order. It's not show anything.
If I don't use rownum, it's show descending order
but show in other page.

SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT,
SHAPE_DESC, COLOR, SPT_BCCY
FROM (SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT,
SHAPE_DESC, COLOR, SPT_BCCY FROM V_TXN_LIST
ORDER BY SPT_BCCY desc)
WHERE ROWNUM <= 10;

result
Item_code...Item_des...Category... Cut...Shape_desc...Color ...Spt_bccy
xxxx..............xxxx............xxxx ..........xx......xxxx................xx
xxxx..............xxxx............xxxx ..........xx......xxxx................xx
xxxx..............xxxx............xxxx ..........xx......xxxx................xx
xxxx..............xxxx............xxxx ..........xx......xxxx................xx
xxxx..............xxxx............xxxx ..........xx......xxxx................xx

Why it's not show in first page same as asc order.
Please help me.

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Re: Pls. help. Why have no output. (order by) [message #333584 is a reply to message #333221]

Sun, 13 July 2008 05:04

vamsi kasina
Messages: 2112
Registered: October 2003
Location: Cincinnati, OH

Senior Member

In your first query, you are selecting top 10 (first 10) after doing ascending order.
In your second query, you are selecting top 10 (last 10) after doing descending order. As NULL is being treated as max value, NULL values are coming as the top 10 records...

What exactly you want to show?
Do you want to show the top 10 (first 10) in descending order?
Try this.

SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT
      ,SHAPE_DESC, COLOR, SPT_BCCY
  FROM (SELECT ITEM_CODE, ITEM_DESCRIPTION, CATEGORY, CUT
              ,SHAPE_DESC, COLOR, SPT_BCCY 
          FROM V_TXN_LIST
         ORDER BY SPT_BCCY asc)
 WHERE ROWNUM <= 10
 ORDER BY SPT_BCCY desc;

By
Vamsi

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Re: Pls. help. Why have no output. (order by) [message #333634 is a reply to message #333221]

Sun, 13 July 2008 21:09

hareluya_17
Messages: 2
Registered: July 2008
Location: Bangkok, Thailand

Junior Member

Oh, Thank you very much.

^______^

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