左边加入两个表格内加入

代码示例

SQL内参加与三个表

SELECT C.customer_id, C.first_name, O.amount, S.status
FROM Customers AS C
INNER JOIN Orders AS O
ON C.customer_id = O.customer
INNER JOIN Shipping AS S
ON C.customer_id = S.customer_id;

sql query内加入表3

# no need to use parentheses - works fine
SELECT * FROM names A
INNER JOIN address B ON A.personID = B.personID
INNER JOIN emailAddress C ON A.personID = C.personID
INNER JOIN phoneNumbers D ON A.personID = D.personID;

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