错误1052：字段列表中的列“ LastName”不明确

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

将SELECT LastName更改为SELECT C.LastName 。

CUSTOMER和ARTIST表均具有LastName列。 您所指的是两个LastName列中的哪一个尚不清楚，因此“ LastName列不明确”。

通过在表别名C前面加上前缀，可以指定要从CUSTOMERS表中获取LastName列。