刪除一個 Select Inner Join 查詢結果

Question

SELECT yturl from ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip;

我想刪除exp的查詢結果，這個查詢結果是：

yturl	ip	ID
eY5WrongXDI	197.XX.XX.XXX	1

雖然我想從 ytpointadder 中刪除它。 我試過 ：

DELETE from ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip;

Answer 1

您不能在 FROM 子句中為更新（刪除）指定相同的目標表。 所以你必須使用另一個外部查詢。

嘗試：

DELETE FROM ytpointadder
WHERE yturl IN  ( SELECT t.yturl FROM (SELECT a.yturl, a.ip from ytpointadder a
                                     JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
                                     Group by a.ip 
                                     ) as t 
                 ) ;

Answer 2

嘗試這個

DELETE FROM ytpointadder
WHERE yturl IN
( 
SELECT a.yturl from  ytpointadder a
JOIN watched b on b.watchedyt = a.yturl AND b.ip = a.ip
Group by a.ip;)