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LEFT JOIN Misunderstanding
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The above is of course totally right, I think it didn't go far enough.  

```
    WITH LastEntries (ProjID, pl_insert, pe_insert)
    AS
    (
      SELECT
        projid,
        max(InsertDate),
        (SELECT max(insertdate) FROM project_extras where projid = e.projid)
        FROM project_list e
        GROUP BY projid
     )
    SELECT a.ProjID, a.Project_Name, count(c.CreatedDate), a.Manager
    FROM Project_List AS a
    LEFT JOIN Project_Extras AS b
        ON a.ProjID = b.ProjID
        AND b.MonthlyRpt = 'y'
        AND b.BudgetYear = '2021'
    LEFT JOIN Project_Highlights AS c
        ON a.ProjID IS c.ProjID
        AND c.CreatedDate LIKE '2021-07-%' 
    LEFT JOIN LastEntries AS d
        ON a.ProjID = d.projid
        AND a.InsertDate = d.pl_insert
        AND b.InsertDate = d.pe_insert
    GROUP BY a.ProjID
    ORDER BY a.Manager, a.ProjID;
```