Problem with aggegate values

Hi all,

I am new to DAX, comming with SQL Server background.
My data is organized in a classic way, two tables:
- Companies, with columns company_id, country and name;

- Impressions, with impression_id, click_id, company_id and timestamp.
The problem I have is with some aggregated values, I can create them as calculated columns on Companies table or as whole new table - however this way allows only filtering on Companies[Country] and I absolutely need to filter on Impressions[timestamp].

Can you please suggest how to modify my DAX?

ADDCOLUMNS (
    SUMMARIZE (
        Impressions;
        Impressions[target_company_id];
        "TotalImpressions"; SUMX ( Impressions; IF ( Impressions[impression_id] > 0; 1 ) );
        "TotalClicks"; SUMX ( Impressions; IF ( Impressions[click_id] > 0; 1 ) )
    );
    "Company Name"; LOOKUPVALUE (
        Companies[Company Name];
        Companies[id]; Impressions[target_company_id]
    )
)

Thanks!