mysql - 如何用 JOIN 重写这条语句，使其更快？

Question

我有一个 mySQL 查询，它正在工作，但是当涉及到 160 万次执行时，它不能满足我需要的性能，因为不断地重新执行NOT EXIST(new query)

INSERT INTO `votes` (`representatives_rID`, `events_eID`, `voteResult`) 
SELECT `representatives`.`rID`,`events`.`eID`,? 
FROM `representatives`, `events` 
WHERE `events`.`eventDateTime` = ? 
AND `representatives`.`rID` = ? 
AND NOT EXISTS (SELECT * FROM `votes` 
                WHERE `votes`.`representatives_rID` = `representatives`.`rID` 
                AND `votes`.`events_eID` = `events`.`eID`);

在示意图中：

if (input one is in `representatives` AND input two is in `events` AND there is no row in `votes` that contains ( `votes`.`representatives_rID` = `representatives`.`rid` and `votes`.`events_eID` = `events`.`eID)) {
    insert a row into votes containing `eid` from `events` and `rid` from `representatives` and input three;
}

有没有办法让这个更快，可能加入？

Answer 1

INSERT IGNORE INTO votes 
(representatives_rID
,events_eID
,voteResult
) 
SELECT r.rID
     , e.eID
     , ?
  FROM representatives r 
 CROSS
  JOIN events e
    ON e.eventDateTime = ? 
   AND r.rID = ?; 

?