錯誤1052：字段列表中的列“ LastName”不明確

Question

CREATE VIEW CustomerInterestsView AS
    SELECT LastName AS CustomerLastName,
            C.FirstName AS CustomerFirstName,
            A.LastName AS ArtistName
    FROM
        CUSTOMER AS C
            JOIN
        CUSTOMER_ARTIST_INT AS CAI ON C.CustomerID = CAI.CustomerID
            JOIN
        ARTIST AS A ON CAI.ArtistID = A.ArtistID;

Answer 1

將SELECT LastName更改為SELECT C.LastName 。

CUSTOMER和ARTIST表均具有LastName列。 您所指的是兩個LastName列中的哪一個尚不清楚，因此“ LastName列不明確”。

通過在表別名C前面加上前綴，可以指定要從CUSTOMERS表中獲取LastName列。