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我有一个查询，每次用户打开他的个人资料页面时都会加载。它真的很慢。加载页面需要 20 多秒。这是一个简单的查询，但有很多行，所以不要害怕看它。:)

我会在改进我的查询方面获得任何帮助。

SELECT 
    `h`.`login` AS `login`,
    SUM(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pips`,NULL)) AS `total_pips`,
    COUNT(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`position_num`,NULL)) AS `total_trades`,
    (COUNT(IF(((`h`.`pl` > 0) AND ((`h`.`cmd` = 0) OR (`h`.`cmd` = 1))),`h`.`pl`,NULL)) / COUNT(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`position_num`,NULL))) AS `winning_trades_percent`,
    SUM(if(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`gain`,NULL)) AS `total_gain`,
    (SELECT AVG(`wg`.`weekly_gain_all`) FROM `gt_view_weekly_gain` `wg` where (`wg`.`login` = `h`.`login`) group by `wg`.`login`) AS `weekly_gain`,
    AVG(IF(((`h`.`pips` > 0) AND ((`h`.`cmd` = 0) OR (`h`.`cmd` = 1))),`h`.`pips`,NULL)) AS `average_profit_pips`,
    AVG(IF(((`h`.`pips` <= 0) AND ((`h`.`cmd` = 0) OR (`h`.`cmd` = 1))),`h`.`pips`,NULL)) AS `average_lose_pips`,
    AVG(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pips`,NULL)) AS `average_pips`,
    AVG(time_to_sec(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),timediff(`h`.`close_time`,`h`.`open_time`),NULL))) AS `average_trade_time`,
    STD(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pips`,NULL)) AS `volatility`,
    MAX(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pips`,NULL)) AS `best_trade`,
    MIN(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pips`,NULL)) AS `worst_trade`,
    (ceiling(((ceiling(to_days(now())) - ceiling(to_days(MIN(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`open_time`,NULL))))) / 7)) - 1) AS `running_weeks`,
    (SELECT `fn`.`followers_num_all` FROM `gt_view_followers_num` `fn` where ((`fn`.`guru_id` = `h`.`guru_or_guru_user_id`) AND (`h`.`is_guru_history` = 1))) AS `followers_num`,
    SUM(IF(((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)),`h`.`pl`,NULL)) AS `total_profit_loss`,
    SUM(IF(((`h`.`cmd` = 6) AND (`h`.`pl` > 0)),`h`.`pl`,NULL)) AS `deposits`,
    SUM(IF(((`h`.`cmd` = 6) AND (`h`.`pl` < 0)),`h`.`pl`,NULL)) AS `withdrawls`,
    COUNT(IF((((`h`.`cmd` = 0) OR (`h`.`cmd` = 1)) AND (`h`.`pl` > 0)),`h`.`position_num`,NULL)) AS `total_winning_trades_count`,
    ABS((AVG(IF(((`h`.`pips` > 0) AND ((`h`.`cmd` = 0) OR (`h`.`cmd` = 1))),`h`.`pips`,NULL)) / AVG(IF(((`h`.`pips` <= 0) AND ((`h`.`cmd` = 0) OR (`h`.`cmd` = 1))),`h`.`pips`,NULL)))) AS `average_profit_loss_ratio` 
FROM 
    `gt_history` `h` 
WHERE
    `h`.`is_closed` = 1
GROUP BY
    `h`.`login`
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2 回答 2

2

这个查询似乎计算了所有用户的值。and (login='xxx')如果您希望仅为一个用户显示此内容，那么在 where 子句中添加可能会快得多。

否则，正如 Mihai 建议的那样，缓存可能是最好的方法。

于 2013-08-26T09:13:10.290 回答
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不要在每列 IF中使用“（ h. cmd= 0）或（h. = 1）”，而是尝试在 where 子句中过滤它。cmd它可能会有所改善，因为减少了数据选择。

于 2013-08-26T09:23:41.970 回答