Re: Flattening a kind of 'dynamic' table
От | Merlin Moncure |
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Тема | Re: Flattening a kind of 'dynamic' table |
Дата | |
Msg-id | 6EE64EF3AB31D5448D0007DD34EEB3412A7611@Herge.rcsinc.local обсуждение исходный текст |
Ответ на | Flattening a kind of 'dynamic' table (Alexandre Leclerc <alexandre.leclerc@gmail.com>) |
Ответы |
Re: Flattening a kind of 'dynamic' table
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Список | pgsql-performance |
> Alexandre Leclerc wrote: > Sorry for jumping in on this thread so late -- I haven't been able to > select * from crosstab( > 'select product_id, department_id, req_time > from product_department_time order by 1', > 'select ''A'' union all select ''C'' union all select ''D''' > ) as (product_id int, a int, c int, d int); I forgot you could do this...This would certainly be easier than parsing array values returned from array_accum. It will probably be faster as well...but with the array approach the query would not have to be modified each time a new department was added. That said, a crosstab based query could be built easily enough from a department query on the client and then you have the best of both worlds. Merlin
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