Re: Return product category with hierarchical info

No worries
Glad it helped !


Best,
Oliver 

Sent from Oliver’s iPhone

> On 5 Jan 2022, at 12:38, Richard Klingler <richard@klingler.net> wrote:
> 
> 
> Hello Oliver
> 
> 
> 
> Exactly that's it...I knew some "join" would be involved...but couldn't find the right example ;-)
> 
> 
> 
> thanks for the quick help :-)
> 
> richard
> 
> 
> 
> On 1/5/22 13:28, Oliveiros Cristina wrote:
>> I’m also no expert, it’s been a decade or so since I do not use psql
>>  But maybe 
>> 
>> Select level3.id, level3.name, level2.name, level1.name,
>> From category level3
>> Join category level2
>> On level2.Id = level3.parent
>> Join category level1
>> On level1.Id = level2.parent
>> 
>> Best,
>> Oliver 
>> 
>> Sent from Oliver’s iPhone
>> 
>>> On 5 Jan 2022, at 12:19, Richard Klingler <richard@klingler.net> wrote:
>>> 
>>> Good afternoon (o;
>>> 
>>> 
>>> First of all, am I am totally no expert in using PGSQL but use it mainly for simple web applications...
>>> 
>>> 
>>> Now I have a table which represents the categories for products in a hierarchical manner:
>>> 
>>>     id | name | parent
>>> 
>>> 
>>> So a top category is represented with parent being 0:
>>> 
>>>     1 | 'Living' | 0
>>> 
>>> 
>>> The next level would look:
>>> 
>>>     2 | 'Decoration' | 1
>>> 
>>> 
>>> And the last level (only 3 levels):
>>> 
>>>     3 | 'Table' | 2
>>> 
>>> 
>>> So far I'm using this query to get all 3rd level categories as I use the output for datatables editor as a product can only belong to the lowest category:
>>> 
>>> select id, name from category
>>> where parent in (select id from category where parent in (select id from category where parent = 0))
>>> 
>>> But this has a problem as more than one 3rd level category can have the same name, therefore difficult to distinguish in the datatables editor which one is right.
>>> 
>>> 
>>> So now my question (finally ;o):
>>> 
>>> 
>>> Is there a simple query that would return all 3rd levels category ids and names together with the concatenated names of the upper levels? Something like:
>>> 
>>> 
>>>     3 | 'Table' | 'Living - Decoration'
>>> 
>>> 
>>> thanks in advance
>>> 
>>> richard
>>> 
>>> 
>>> 
>>> PS: If someone could recommend a good ebook or online resource for such stupid questions, even better (o;
>>> 
>>> 
>>> 
>>>