SQL window function over partition by syntax error

Question

I have a test table with two columns brand and store

brand	store
A	a
A	b
B	a

I'm trying to use the window function to get the output like this

brand	store	num_stores
A	a	2
A	b	2
B	a	1

Here's what I've been trying on both presto sql and sqlite but keep getting "(" syntax error.

select brand, store, 
count(store) OVER (PARTITION BY brand) as num_stores
from table

Struggling to find why I got this error and how to fix. Appreciate your help:))

Answer 1

It could be that your particular database does not support analytic functions. In that case, you could, as a workaround, try the following:

SELECT t1.brand, t1.store, t2.cnt AS num_stores
FROM yourTable t1
INNER JOIN
(
    SELECT brand, COUNT(store) AS cnt
    FROM yourTable
    GROUP BY brand
) t2
    ON t2.brand = t1.brand;

Answer 2

You can try with the below query:

select brand, store, count(*) OVER (PARTITION BY brand, store) as num_stores from table;

Answer 3

You are missing () brackets for alias covering. You can check my query in db-fiddle

SELECT 
      Brand, 
      Store, 
      (COUNT(Store) OVER (PARTITION BY Brand)) as Num_Stores
FROM your_table