Re: [SQL] Query for duplicates.
От | John M. Flinchbaugh |
---|---|
Тема | Re: [SQL] Query for duplicates. |
Дата | |
Msg-id | Pine.LNX.4.10.9908051618140.13066-100000@butterfly.hjsoft.com обсуждение исходный текст |
Ответ на | Query for duplicates. (Matthew Hagerty <matthew@venux.net>) |
Список | pgsql-sql |
On Thu, 5 Aug 1999, Matthew Hagerty wrote: > I found myself in an unusual situation today. I need a query to display > only customers with addresses that appear more than once. Usually I am > having to get unique addresses, etc. at which I have become very good, but > this one is giving me a run for. > What I need is something like this: > create table customer ( > custdate date, > name varchar(30), > address varchar(30), > city varchar(20), > state varchar(2), > zip varchar(10)); > select address,city,state,zip from customer > where custdate<='05-30-1999' > group by address having count(address)>1; select address,city,state,zip from customer where custdate<='05-30-1999' group by address,city,state,zip having count(*)>1; ____________________}John Flinchbaugh{______________________ | -> glynis@hjsoft.com <- john@cs.millersv.edu | | glynis@netrax.net http://www.hjsoft.com/~glynis/ | ~~Powered by Linux: Reboots are for hardware upgrades only~~
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