Re: Merging 2 rows in a table

[Pavel Stehule <pavel.stehule@xxxxxxxxx>]

2011/1/3 Alexander Farber <alexander.farber@xxxxxxxxx>:
> Hello,
>
> through some obscure error (probably on my side)
> I have several thousand entries for Jan 1 and Jan 2
> ending up in the ISO week 2011-52 instead of 2010-52
> which breaks the bar chart at the top of my script
> http://preferans.de/user.php?id=OK504891003571
>
> # select * from pref_money where id='OK324712148886';
>    id    | money |  yw
> ----------------+-------+---------
> ÂOK324712148886 | Â 203 | 2010-46
> ÂOK324712148886 | Â 219 | 2010-49
> ÂOK324712148886 | Â 115 | 2010-51
> ÂOK324712148886 | Â Â63 | 2010-52
> ÂOK324712148886 | Â Â20 | 2011-01
> ÂOK324712148886 | Â Â10 | 2011-52
>
> # \d pref_money
> Â Â Â Â Â Â Â Â Â Â Â ÂTable "public.pref_money"
> ÂColumn |     Type     Â|        ÂModifiers
> --------+-----------------------+-----------------------------------------
> Âid   | character varying(32) |
> Âmoney Â| integer        | not null
> Âyw   | character(7)     Â| default to_char(now(), 'YYYY-IW'::text)
> Indexes:
> Â Â"pref_money_yw_index" btree (yw)
> Foreign-key constraints:
> Â Â"pref_money_id_fkey" FOREIGN KEY (id) REFERENCES pref_users(id)
>
> I would like to fix that problem by adding
> 2011-52 values of money (10 above) to the
> 2010-52 values of money (63 above, should become 73)
> and then dropping all rows with the
> wrong week number yw='2011-52'.
>
> So I'm trying:
>
> # update pref_money set money=money+
> Â Â(select money from pref_money where yw='2011-52')
> Â Âwhere yw='2010-52';
> ERROR: Âmore than one row returned by a subquery used as an expression
>
> ok, I probably need to specify the id for the subquery
> in round brackets above - so I try again:
>
> # update pref_money as m1 set money=money+
> (select coalesce(money,0) from pref_money as m2
> where m1.id=m2.id and m2.yw='2011-52')
> where m1.yw='2010-52';
> ERROR: Ânull value in column "money" violates not-null constraint

update tab set money = money + COALESCE((SELECT ...) , 0) ..

Regards

Pavel Stehule

>
> Can anybody please help me here?
>
> Thank you
> Alex
>
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