Re: postgresql how to duplicate rows in result.

Il 15/02/2017 19:11, Alessandro Baggi ha scritto:
> Il 14/02/2017 21:51, Merlin Moncure ha scritto:
>> On Tue, Feb 14, 2017 at 12:36 PM, Merlin Moncure <mmoncure(at)gmail(dot)com>
>> wrote:
>>> On Tue, Feb 14, 2017 at 12:04 PM, Alessandro Baggi
>>> <alessandro(dot)baggi(at)gmail(dot)com> wrote:
>>>> Hi list,
>>>> sorry for my english, I will try to example as well. I've a query
>>>> that joins
>>>> multiple tables and return a result like:
>>>>
>>>> id,customers,phone,code,number
>>>> 1 , aaaaaaaa,33333,123 , 2
>>>> 2 , aassdsds,33322,211 , 1
>>>> 3 , oooooooo,21221,221 , 1
>>>>
>>>>
>>>> I need, where "number" field is > 1, to duplicate the row * N(number
>>>> field
>>>> value) with a result like this:
>>>>
>>>> id,customers,phone,code,number
>>>> 1 , aaaaaaaa,33333,123 , 2
>>>> 1 , aaaaaaaa,33333,123 , 2
>>>> 2 , aassdsds,33322,211 , 1
>>>> 3 , oooooooo,21221,221 , 1
>>>>
>>>> How I can accomplish to this problem?
>>>
>>> SELECT * FROM foo CROSS JOIN LATERAL (1,number);
>>>
>>> :-D
>>
>> oops -- copy/paste error
>>
>> SELECT * FROM foo CROSS JOIN LATERAL generate_series(1,number);
>>
>> merlin
>> .
>>
> Hi Merlin,
> I've tried your suggested code and with cross join and generate_series I
> can generate multiple row. There is a way to put as second args a column
> values? I've tried to put "table.number" column values but I got
> "generate_series() does not exists". Inserting a simple int like 5 I get
> 5 results for each row.
>
> I've searched on google but can't find a valid example.
>
>
>
> Thanks in advance.
>
>
Hi Merlin,
I've solved my problem (passing column as number) using a cast
generate_series(1,table.number::int)

thanks to all for answart.

SOLVED