Sory gak pake di kata-kata lagi, ini dari kolom tabel yang berbeda, semoga bermafaat.
SELECT
a.DATE_TABEL_A AS Tanggal_A,
to_date(b.DATE_TABEL_B,'yyyy-mm-dd') AS Tanggal_B,
CAST (DAYS(to_date(SUBSTR(a.DATE_TABEL_A,1,10),'yyyy-mm-dd'))-DAYS(to_date(b.DATE_TABEL_B,'yyyy-mm-dd')) AS INTEGER) AS JUMLAH_HARI
FROM TABEL_A a
left join TABEL_B b on a.ID_UNIQ=b.ID_UNIQ
fetch first 10 row only;
Koment aja yak kalo bingung......

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