MySQL-計算2個不同表中兩列之間的差異並插入

Question

我有以下語句，該語句需要再添加1個子查詢以計算tweeps表中的關注者數量與ranking表中當前列的數量之間的差，並在ranking表中latest列中插入差異，以確保PK為屏幕名稱 ，

像tweeps表中跟隨者coulm中的數字是10當前coulmn n排名表，相同的屏幕名稱是5，該值將被添加到最新的+5

mysql_query ("
    INSERT  INTO ranking
    SELECT @rank := @rank + 1, tweeps.* FROM tweeps
    JOIN( SELECT @rank := 0 ) AS init
    ORDER BY followers DESC
    ON DUPLICATE KEY UPDATE
    ranking.ranking = @rank, 
    ranking.name = tweeps.name,
    ranking.followers = tweeps.followers,
    ranking.tweets = tweeps.tweets,
    ranking.location = tweeps.location,
    ranking.`join date` = tweeps.join_date,
    ranking.avatar = tweeps.avatar;");
mysql_close($con);

Answer 1

嘗試這個：

INSERT INTO ranking
SELECT @rank := @rank + 1, tweeps.* FROM tweeps
JOIN( SELECT @rank := 0 ) AS init
ORDER BY followers DESC
ON DUPLICATE KEY 
UPDATE ranking set
ranking = @rank, 
name = tweeps.name,
followers = tweeps.followers - followers,
tweets = tweeps.tweets,
location = tweeps.location,
`join date` = tweeps.join_date,
avatar = tweeps.avatar;

我將語法更改為ON DUPLICATE KEY UPDATE ranking set...