如何使这个MySQL查询运行得更快？

我在MySQL数据库中有以下查询，执行它需要1.9秒，我想让它运行得更快

select 
    1 AS `auto`,
    `stock2`.`PhoneModal_Name` AS `PhoneModal_Name`,
    `stock2`.`Rate` AS `Rate`,
    (sum(`stock2`.`Quantity_take`) - sum(`stock2`.`Quantity_give`)) AS `balance`,
    `stock2`.`Unit_Name` AS `Unit_Name`,
    `stock2`.`STORE_NAME` AS `STORE_NAME`,
    `stock2`.`PhoneModal_No` AS `PhoneModal_No`,
    ((1 / 1) / 2018) AS `orderdate`,
    sum(`stock2`.`Quantity_take`) AS `take`,
    sum(`stock2`.`Quantity_give`) AS `give`
from
    `stock2`
group by `stock2`.`PhoneModal_Name` , `stock2`.`Rate` , `stock2`.`Unit_Name` ,
         `stock2`.`STORE_NAME` , `stock2`.`PhoneModal_No`

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请确保在stock2上为group by中的列创建了一个复合索引

create index  idx1 on stock2 ( PhoneModal_Name,  Rate, Unit_Name,
                               STORE_NAME, PhoneModal_No )

---

确保你已经创建了与你分组方式相对应的索引。见鬼<代码>（（1/1）/2018）？这是

0.00049554

。也许您想要

“2018/01/01”

您的表中有多少行？请提供

SHOW CREATE table

。大约25000行