Fix: Perform Value Count with Specific Conditions inside subwindows SQL Presto

 To perform a value count with specific conditions inside subwindows in SQL with Presto, you can use the `COUNT` function along with window functions like `PARTITION BY` to specify the conditions within subgroups. Here's an example:

Let's say you have a table called `sales` with columns `product_id`, `sale_date`, and `quantity_sold`, and you want to count the number of sales for each product within a specific date range.

```sql

SELECT

  product_id,

  sale_date,

  COUNT(*) OVER (PARTITION BY product_id ORDER BY sale_date ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS sales_count

FROM sales

WHERE sale_date >= '2023-01-01' AND sale_date <= '2023-12-31'

ORDER BY product_id, sale_date;

```

In this SQL query:

- We use the `COUNT(*)` function to count the number of rows within each window defined by the `PARTITION BY` clause.

- We partition the data by `product_id`, so the count is reset for each different product.

- We order the rows within each partition by `sale_date` to create the subwindows.

- We use `ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING` to include all rows in each subwindow.

- The `WHERE` clause specifies the specific conditions for the date range.

This query will count the number of sales for each product within the given date range and return the result in ascending order of `product_id` and `sale_date`.

You can adapt this query to your specific requirements by changing the column names and conditions as needed.