Question

我有这个问题：

SELECT 
    s.last_spread, s.sd, s.mean, s.id
    ,c.id_ticker, c.coef
    ,t.ticker
    ,/*p.last,*/ p.price

FROM (SELECT * FROM spreads WHERE spreads.id_check=1 LIMIT 60,896) as s 

    INNER JOIN coef as c 
        ON c.id_spread = s.id

    INNER JOIN tickers AS t
            ON t.id = c.id_ticker

    LEFT JOIN (SELECT prices.id_ticker, MAX(prices.date) as last, prices.price FROM prices GROUP BY prices.id_ticker) AS p
            ON p.id_ticker = t.id

ORDER BY s.id, c.id

最后一次JOIN没有返回正确的值....我需要获得代码的最后一个价格（所以每个代码的最后一行）。

目前它返回第一个价格，如何更改整个查询以获取每个ticker.id的最后价格？（p.id_ticker = t.id）

谢谢！

Answer 1

通过此子查询添加订单：

SELECT prices.id_ticker, MAX(prices.date) as last, prices.price 
FROM prices GROUP BY prices.id_ticker 
order by prices.id_ticker desc

Answer 2

使用A having子句会很优雅：

LEFT JOIN (SELECT prices.id_ticker, prices.date as last, prices.price FROM prices GROUP BY prices.id_ticker HAVING prices.date = MAX(prices.date) )

编辑但 NOT 工作......（请参阅下面的评论）

Answer 3

我会说使用ORDER BY和LIMIT只能获得一个价格（最后价格）。

获取MYSQL中的最后一行

3 个答案: