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
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;