Re: SQL Help

From: Stephane Faroult <sfaroult_at_oriole.com>
Date: Fri, 13 Sep 2002 15:43:20 -0800
Message-ID: <F001.004D0030.20020913154320@fatcity.com>

"Guidry, Chris" wrote:
>
> Hi All,
> Any ideas how I can get this into a tabular form (i.e. one row per
> serialnumber)?
> There may be gaps (nulls) anywhere in the data for a given month.
> I've tried with PL/SQL but it's difficult to account for gaps.
> The following is the closest I've come.
> O7345
> TGIF
>
> 1 SELECT mm.serialnumber, m.type
> 2 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'JAN', MAX(ROUND(mm.data1, 2))) JAN
> 3 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'FEB', MAX(ROUND(mm.data1, 2))) FEB
> 4 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'MAR', MAX(ROUND(mm.data1, 2))) MAR
> 5 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'APR', MAX(ROUND(mm.data1, 2))) APR
> 6 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'MAY', MAX(ROUND(mm.data1, 2))) MAY
> 7 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'JUN', MAX(ROUND(mm.data1, 2))) JUN
> 8 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'JUL', MAX(ROUND(mm.data1, 2))) JUL
> 9 ,DECODE(TO_CHAR(mm.readdt, 'MON'), 'AUG', MAX(ROUND(mm.data1, 2))) AUG
> 10 FROM metera m, meterm mm, serialnumber s
> 11 WHERE mm.data1id=111
> 12 AND mm.readtype = 1
> 13 AND TRUNC(mm.readdt) > TO_DATE('31-DEC-2001','DD-MON-YYYY')
> 14 AND TRUNC(mm.readdt) < TO_DATE('01-SEP-2002','DD-MON-YYYY')
> 15 AND mm.port = 0
> 16 AND m.port = 0
> 17 AND (s.id = 31 OR s.id = 33)
> 18 AND mm.serialnumber = s.serialnumber
> 19 AND m.serialnumber = mm.serialnumber
> 20 GROUP BY mm.serialnumber, m.type, TO_CHAR(mm.readdt, 'MON')
> 21 ORDER BY mm.serialnumber, m.type, TO_DATE(TO_CHAR(mm.readdt, 'MON'),
> 'MON');
>
> SERIALNUMBER TYPE JAN FEB MAR APR MAY JUN
> JUL AUG
> ------------ ----------- --------- --------- --------- --------- ---------
> --------- --------- ---------
> 35891 X47693
> 67.94
> 36515 X47007 2504.23
> 36515 X47007 2773.35
> 36515 X47007 3016.51
> 36515 X47007 3182.65
> 36515 X47007 3286.03
> 36515 X47007
> 3432.04
> 36515 X47007
> 3520.23
> 36524 X07205 2101.18
> 36524 X07205 2279.76
> 36524 X07205 2448.01
> 36524 X07205 2621.93
> 36524 X07205 2753.39
> 36524 X07205
> 2834.15
> 36524 X07205
> 2917.87
> 36524 X07205
> 2991.37
> 36525 X47007 1642.29
> 36525 X47007 0
> 36525 X47007 1922.61
> 36525 X47007 2056.58
> 36525 X47007 2209.88
> 36525 X47007
> 0
> 36525 X47007
> 2532.08
> 36525 X47007
> 2706.53
> 36527 X17007 743.32
> 36527 X17007 807.93
> 36527 X17007 871.34
> 36527 X17007 939.58
> 36527 X17007 1010.61
> 36527 X17007
> 1093.55
> 36527 X17007
> 1199.93
> 36527 X17007
> 1290.5
>
> --
> Chris J. Guidry P.Eng. EE
> ATCO Electric, Metering Services
> Phone: (780) 420-4142
> Fax: (780) 420-3854
> Email: chris.guidry_at_atcoelectric.com
>

Just one little step further. Put all of this between parentheses in the FROM clause of a query and write

select serialnumber, type,

       decode(sum(nvl(JAN, 0), 0, NULL, sum(nvl(JAN, 0)) JAN,
       ...

from (your query)
group by serialnumber, type;

Wouldn't do it on millions of rows, though.

-- 
Regards,

Stephane Faroult
Oriole Software
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

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Received on Fri Sep 13 2002 - 18:43:20 CDT