我有以下语句,需要再添加1个子查询来计算tweeps
表中的关注者数量与ranking
表中当前列中的数量之间的差异,并插入latest
表中名为ranking
的列中的差异确定PK是屏幕名称,
在tweeps表中跟随者coulm中的数字是10个当前coulmn n排名表,对于同一个screenname是5,该值将被添加到最新的是+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);
答案 0 :(得分:1)
试试这个:
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;
我将语法更改为ON DUPLICATE KEY UPDATE ranking set...