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Re: Convert of string to array problem

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Thom Brown <thombrown(at)gmail(dot)com>
Cc: Bård Grønbech <baard(dot)gronbech(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: Convert of string to array problem
Date: 2010-04-29 12:59:09
Message-ID: s2wb42b73151004290559ua67f2bc0k2bb9ac3d735d91a@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-general
On Thu, Apr 29, 2010 at 8:52 AM, Thom Brown <thombrown(at)gmail(dot)com> wrote:
> On 29 April 2010 13:35, Bård Grønbech <baard(dot)gronbech(at)gmail(dot)com> wrote:
>>
>> Have a string like '0.1;0.2;null;0.3' which I would like to convert
>> into a double precision[] array.
>>
>> Trying:
>>
>> select cast (string_to_array('0.1;0.2;null;0.3', ';') as float8[])
>>
>> gives me an error: invalid input syntax for type double precision: "null".
>>
>> Can anybody help me?
>>
>> -Bård
>>
>
> I believe string_to_array will take that null as a string called 'null',
> which it can't convert to a float8.

select array(select case when n='null' then null else n end from
unnest(string_to_array('0.1;0.2;null;0.3', ';')) as n);

?column?
--------------------
 {0.1,0.2,NULL,0.3}

merlin

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