Mysql 如何使用subselect更新表
我试图将subselect的输出与更新表中的字段连接起来。但使用MySQL无法正确实现 你知道怎么做吗Mysql 如何使用subselect更新表,mysql,sql,Mysql,Sql,我试图将subselect的输出与更新表中的字段连接起来。但使用MySQL无法正确实现 你知道怎么做吗 update INSTRUMENTDAILYINFO info set info.vWap = (SELECT t1.vWap FROM INSTRUMENTDAY t1 JOIN (SELECT Date(tradedate)
update INSTRUMENTDAILYINFO info
set
info.vWap = (SELECT
t1.vWap
FROM
INSTRUMENTDAY t1
JOIN
(SELECT
Date(tradedate) date_date,
stockName,
min(tradedate) min_date
FROM
INSTRUMENTDAY
GROUP BY date_date , stockName) t2 ON t1.tradedate = t2.min_date
AND t1.stockName = t2.stockName
order by t1.tradedate , t1.stockName asc)
where
t1.tradeDate = info.tradeDate
and t1.stockName = info.stockName
SELECT
`INSTRUMENTDAILYINFO`.`ID`,
`INSTRUMENTDAILYINFO`.`CLOSEPRICE`,
`INSTRUMENTDAILYINFO`.`HIGHVALUE`,
`INSTRUMENTDAILYINFO`.`LOWVALUE`,
`INSTRUMENTDAILYINFO`.`STARTPRICE`,
`INSTRUMENTDAILYINFO`.`STOCKNAME`,
`INSTRUMENTDAILYINFO`.`TRADEDATE`
FROM `INSTRUMENTDAILYINFO`;
SELECT
`INSTRUMENTDAY`.`ID`,
`INSTRUMENTDAY`.`STOCKNAME`,
`INSTRUMENTDAY`.`TRADEDATE`,
`INSTRUMENTDAY`.`VWAP`
FROM `SimpleGrowth`.`INSTRUMENTDAY`;
如果在主表和x子查询之间有一个连接列,则类似于此。someCommonColumn指的是什么tradeDate和stockName?我在运行查询时更新了0行。@user2130951 show tables structure、INSTRUMENTDAILYINFO和INSTRUMENTDAY-应该在那里使用链接2的外键列。非常好!保存此查询。只需添加一个表字段就可以了,因为一个表字段是Timestamp,另一个表字段是date,如果date(x.tradeDate)=info.tradeDate,那么它就可以工作了。您能创建一个fiddle吗?
UPDATE INSTRUMENTDAILYINFO info
JOIN
(SELECT t1.vWap,t1.tradedate as tradedate,t2.stockName as stockName
FROM INSTRUMENTDAY t1
JOIN
(SELECT
Date(tradedate) date_date,
stockName,
min(tradedate) min_date
FROM
INSTRUMENTDAY
GROUP BY date_date , stockName) t2 ON t1.tradedate = t2.min_date
AND t1.stockName = t2.stockName
ORDER BY t1.tradedate , t1.stockName asc)x
ON
x.tradeDate = info.tradeDate
AND x.stockName = info.stockName
SET info.vWap= x.vWap