Bagaimana cara menghitung kueri berdasarkan hari di Oracle sql

Sederhana saja. Cukup tulis pernyataan pilih luar seperti di bawah ini:

select a.* 
    from 
    (SELECT
        AGENT
       ,DATE_1 
       ,ROW_NUMBER() OVER (PARTITION BY AGENT ORDER BY DATE_1) AS COUNT_1    
    FROM
        PROJECT ) a
    where a.COUNT_1  = 1    ;