Question

我正在尝试使用CREATE VIEW以及来自3个不同表格的多个单元格，并在两个单元格之间进行相乘。这个地方有一个语法错误，但我似乎无法识别它。

CREATE VIEW ORDERS AS CustFirstname, CustLastName, o.Ordernumber AS OrderNumber, 
o. OrderDate AS OrderDate, o.ShipDate AS ShipDate, c.QuotedPrice, 
c.QuantityOrdered, c.QuotedPrice * c.QuantityOrdered AS ItemTotal FROM Customers 
NATURAL JOIN Orders o NATURAL JOIN Order_Details c

更新：如果我用“SELECT”替换“CREATE VIEW ORDERS AS”似乎有效

Answer 1

您缺少最重要的语句“SELECT”。

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Answer 2

在您的CREATE VIEW声明中，您遗漏了查询的SELECT：

CREATE VIEW ORDERS AS 
    SELECT CustFirstname, CustLastName, o.Ordernumber AS OrderNumber, 
        o. OrderDate AS OrderDate, o.ShipDate AS ShipDate, c.QuotedPrice, 
        c.QuantityOrdered, c.QuotedPrice * c.QuantityOrdered AS ItemTotal 
    FROM Customers NATURAL JOIN Orders o NATURAL JOIN Order_Details c

根据CREATE VIEW的定义，您可以看到select_statement是必需的：

CREATE
    [OR REPLACE]
    [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
    [DEFINER = { user | CURRENT_USER }]
    [SQL SECURITY { DEFINER | INVOKER }]
    VIEW view_name [(column_list)]
    AS select_statement
    [WITH [CASCADED | LOCAL] CHECK OPTION]

您可以在official docs上找到有关CREATE VIEW的更多信息。

将CREATE VIEW与多个表一起使用

2 个答案: