php - 改进查询运行时间(加载页面需要 20 秒以上)

Question

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该查询。 而且它真的很慢。加载页面需要超过 20 秒。 这是一个简单的查询，但有很多行，所以不要害怕看到它。 :)

我希望获得有关改进我的查询的任何帮助。

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`

Answer 1

看来这个查询计算了所有用户的值。如果您只想为一个用户显示此信息，那么在 where 子句中添加 and (login='xxx') 可能会更快。

否则，正如 Mihai 所建议的那样，缓存可能是最好的方法。