TA貢獻1865條經驗 獲得超7個贊
UPDATE t1
INNER JOIN t2 ON t2.t1_id = t1.id
INNER JOIN t3 ON t2.t3_id = t3.id
SET t1.a = 'something',
t2.b = 42,
t3.c = t2.c
WHERE t1.a = 'blah';
要查看要更新的內容，可以將其轉換為SELECT語句，例如：
SELECT t2.t1_id, t2.t3_id, t1.a, t2.b, t2.c AS t2_c, t3.c AS t3_c
FROM t1
INNER JOIN t2 ON t2.t1_id = t1.id
INNER JOIN t3 ON t2.t3_id = t3.id
WHERE t1.a = 'blah';
使用與其他答案相同的表的示例：
SELECT Books.BookID, Orders.OrderID,
Orders.Quantity AS CurrentQuantity,
Orders.Quantity + 2 AS NewQuantity,
Books.InStock AS CurrentStock,
Books.InStock - 2 AS NewStock
FROM Books
INNER JOIN Orders ON Books.BookID = Orders.BookID
WHERE Orders.OrderID = 1002;
UPDATE Books
INNER JOIN Orders ON Books.BookID = Orders.BookID
SET Orders.Quantity = Orders.Quantity + 2,
Books.InStock = Books.InStock - 2
WHERE Orders.OrderID = 1002;
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