Re: [SQL] count() question
От | Mitch Vincent |
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Тема | Re: [SQL] count() question |
Дата | |
Msg-id | 012301bf4a47$30f59ec0$0300000a@doot.org обсуждение исходный текст |
Ответ на | Re: [SQL] count() question (Peter Eisentraut <peter_e@gmx.net>) |
Ответы |
Re: [SQL] count() question
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Список | pgsql-sql |
> Why do you want to avoid that? If you need two different results then you > probably have to use two different queries. Speed, resource consumption and there might not be any need for it :-) >I assume you need the count to > display something like "x matches found" and use LIMIT/OFFSET to step > through them page by page. I do use LIMIT / OFFSET and that's part of the problem. I can't get a total count from a query when I use LIMIT and OFFSET (at least I don't know how).. > In that case there is really no way but to > query twice. If your query is really complicated and slow you might want > to put the complete query results in a temporary table, and select the > count and the to-be-displayed data from there. Indeed, that might be a better way to structure the search however at this point I have to work withion what is already there (there is a huge application built around the search engine). I am going to totally re-write this but can't do that now, now I needed to add some functionality with a minimum impact on the rest of the application. If I have to do another query, so be it. I just wanted to make sure there wasn't a way for me to do something like : select * from applicants as a, count(*) as total where a.status = 'A' limit 10 offset 0 Of course I know I can't do that like that but thought there might be a substitute or alternative way of getting the count from within the query. -Mitch
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