sql cara membuat kueri pemilihan

Anda cukup CAST() lewat sini

SELECT cast(yourNumber as varchar(10))
FROM yourTable

Kemudian jika Anda ingin JOIN berdasarkan itu, Anda dapat menggunakan:

SELECT *
FROM yourTable t1
INNER JOIN yourOtherTable t2
    on cast(t1.yourNumber as varchar(10)) = t2.yourString