Re: How to count the number of items in an Array?
От | Andreas Kretschmer |
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Тема | Re: How to count the number of items in an Array? |
Дата | |
Msg-id | 20100221083829.GA9280@tux обсуждение исходный текст |
Ответ на | How to count the number of items in an Array? (Andre Lopes <lopes80andre@gmail.com>) |
Ответы |
Re: How to count the number of items in an Array?
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Список | pgsql-general |
Andre Lopes <lopes80andre@gmail.com> wrote: > Hi, > > I have googled, but I can't find how to count the number of items in an Array > in Plpgsql. > > Someone can give me a clue on that? Sure, you can use array_upper() - array_lower(): Zeit: 0,205 ms test=*# select array_upper(array[1,2,3],1) - array_lower(array[1,2,3],1); ?column? ---------- 2 (1 Zeile) or: test=*# select array_upper(array[1,2,3],1) - array_lower(array[1,2,3],1) + 1; ?column? ---------- 3 (1 Zeile) Or, if your array starts with the first element, simple: test=*# select array_upper(array[1,2,3,NULL,5],1); array_upper ------------- 5 (1 Zeile) Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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