SQL server query column yes or no

SELECT  a.ID, a.FirstName, a.Lastname,
        CASE WHEN COUNT(b.CustID) > 0 THEN 'YES' ELSE 'NO' END AS HasOrders
FROM    Customer a
        LEFT JOIN Orders b
            ON a.ID = b.CustID        -- <<== the linking column on both tables
GROUP   BY a.ID, a.FirstName, a.Lastname

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