怎樣從一個表中的SQLite

Question

刪除多行我有一個子查詢，因爲這：

SELECT INTER1.LID1 AS ILID1,INTER1.LID2 AS ILID2 FROM 
(SELECT L1.ID1 AS LID1, L1.ID2 AS LID2 FROM Friend F1 
INNER JOIN Likes L1 
ON F1.ID1 = L1.ID1 AND F1.ID2 = L1.ID2) INTER1 
LEFT JOIN Likes L2 
ON (INTER1.LID1 = L2.ID2 AND INTER1.LID2 = L2.ID1) 
WHERE (L2.ID1 IS NULL AND L2.ID2 IS NULL) 

這樣做的輸出如下：

 ID1 ID2 

    1641 1468 
    1911 1247 

現在我要刪除這兩個從表中這些行LIKES其格式如下：

ID1  ID2 

1689  1709 
1709  1689 
1782  1709 
1911  1247 
1247  1468 
1641  1468 

我試圖此使用以下查詢SQLite中來完成：

DELETE FROM Likes 
WHERE EXISTS 
(SELECT INTER1.LID1 AS ILID1,INTER1.LID2 AS ILID2 FROM 
(SELECT L1.ID1 AS LID1, L1.ID2 AS LID2 FROM Friend F1 
INNER JOIN Likes L1 
ON F1.ID1 = L1.ID1 AND F1.ID2 = L1.ID2) INTER1 
LEFT JOIN Likes L2 
ON (INTER1.LID1 = L2.ID2 AND INTER1.LID2 = L2.ID1) 
WHERE (L2.ID1 IS NULL AND L2.ID2 IS NULL)); 

但它不按預期工作，它不是隻刪除那些行。

然後我試着用INNER JOIN來解決這個問題，但是在DELETE函數中INNER JOIN的功能在SQLite中沒有。

我該如何做這項工作。

請幫助

Answer 1

就在一次兩個值進行比較：

DELETE FROM Likes 
WHERE (ID1, ID2) IN (SELECT ... your original query ...); 

Row values需要SQLite的3.15或更高版本。 如果您使用的是較早的版本，你要查找刪除一個單列主鍵（rowid，或者你已經聲明爲INTEGER PRIMARY KEY）在一個單獨的步驟行：

DELETE FROM Likes 
WHERE rowid IN (SELECT Likes.rowid 
       FROM Likes 
       JOIN (SELECT ... your original query ...) AS IDs 
        ON Likes.ID1 = IDs.ILID1 
       AND Likes.ID2 = IDs.ILID2);