PostgreSQL with-delete “relation does not exists”

Question

I am using postgreSQL 9.1 and I want to delete duplicates from my table using this tip: https://stackoverflow.com/a/3822833/2239537

So, my query looks like that:

Answer 1

that's because CTE in PostgreSQL works differently than CTE in SQL Server. In SQL Server CTE are like an updatable views, so you can delete from them or update them, in PostgreSQL you cannot.

you can join cte and delete, like:

with cte as (
    select
        id,
        row_number() over(partition by code, card_id, parent_id order by id desc) as rn
    from card
)
delete
from card
where id in (select id from cte where rn > 1)

On the other hand, you can write DDL statements inside CTE in PostgreSQL (see documentation) and this could be very handy. For example, you can delete all rows from card and then insert only those having row_number = 1:

with cte1 as (
    delete
    from card
    returning *
), cte2 as (
    select
        row_number() over(partition by code, card_id, parent_id order by id desc) as rn,
        *
    from cte1
)
insert into card
select 
from cte2
where rn = 1