当我在SQL语句WHERE类中使用“ 12345”之类的文字时,SQL语句执行时间为0.019秒,但是当我使用IN参数时,相同的UDP消耗4.19秒
CREATE DEFINER = `root`@`localhost` PROCEDURE `test_PFM`(IP_param VARCHAR(6))
BEGIN
/*
test query speed
purpose:
Use compare query out pu
Bug:
UDP takes 4 seconds when
locojourney.LocoNumber = IP_param
where as if locojourney.LocoNumber = '11516'
executes at 0.019 second
*/
DECLARE Output VARCHAR(1) ;
SELECT locojourney.IShoc
INTO Output
FROM locojourney
WHERE
locojourney.JourneySerla = (
SELECT MAX(locojourney.JourneySerla) FROM locojourney
WHERE locojourney.LocoNumber = '11516') LIMIT 1;
SELECT Output;
END;
最佳答案
我衷心感谢Raymond先生和DRapp先生为我指明了正确的方向,实际上我是在将字符串编入smallint领域。
请标记线程为已解决。
关于mysql - MySQL存储过程使用参数变量消耗1:8倍,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55559503/