[英]Update a column based on a field from another table
你嘗試過這樣的事嗎?
UPDATE Pieces
SET price = 42
WHERE manufacturer_id = (
SELECT id
FROM Manufacturers
WHERE Name = 'FooBar Inc.'
)
對於SQLite,UPDATE語句中沒有JOIN功能。 你唯一的選擇是制作相關的子查詢:
UPDATE pieces
SET price = (SELECT SUM(price)
FROM manufacturers
WHERE pieces.manufacture_id = manufacturers.id)
WHERE manufacture_id in (SELECT id
FROM manufacturers
WHERE name IN ('boo', 'foo'));
這不是很有效,但您可以根據自己的需要進行調整。
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