UNION
を使用できます 、重複を削除します(UNION ALL
重複を保持します)
SELECT FirstUrlColumn AS url
FROM myTable
UNION
SELECT secondUrlColumn AS url
FROM myTable
UNION
を使用できます 、重複を削除します(UNION ALL
重複を保持します)
SELECT FirstUrlColumn AS url
FROM myTable
UNION
SELECT secondUrlColumn AS url
FROM myTable