Re: where not unique
От | Paul Thomas |
---|---|
Тема | Re: where not unique |
Дата | |
Msg-id | 20040312135700.A19064@bacon обсуждение исходный текст |
Ответ на | where not unique (Gary Stainburn <gary.stainburn@ringways.co.uk>) |
Список | pgsql-sql |
On 12/03/2004 13:02 Gary Stainburn wrote: > Hi folks, > > I've got a table which contains amongst other things a stock number and a > > registration number. I need to print out a list of stock number and reg > number where reg number is not unique (cherished number plate transfer > not > completed). I've tried variations of a theme based on > > select stock_number, registration from stock where registration in > (select registration, count(registration) as count > from stock where count > 1 group by registration); > > but I have two problems. Firstly with the sub-select I get: > > usedcars=# select registration, count(registration) as count from stock > where > count > 1 group by registration; > ERROR: Attribute 'count' not found > usedcars=# > > although if I miss out the where clause I get the expected results. > > Secondly, when I run the full query I get: > > usedcars=# select stock_number, registration from stock > usedcars-# where registration in > usedcars-# (select registration, count(registration) as count from stock > group > by registration); > ERROR: Subselect has too many fields > usedcars=# > > which is obviously because of the count field. > > Can anyone tell me where I'm going wroing with these count fields? > (I've tried renaming the field to regcount in case it was a reserved word > > problem) If I understand you correctly, you've got something like mytable stockno regno -------------- SN1 REG1 SN2 REG2 SN3 REG3 SN4 REG2 and you want to list REG2. Something like select regno from mytable group by regno having count(stockno) > 1; might do it. HTH -- Paul Thomas +------------------------------+---------------------------------------------+ | Thomas Micro Systems Limited | Software Solutions for Business | | Computer Consultants | http://www.thomas-micro-systems-ltd.co.uk | +------------------------------+---------------------------------------------+
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