Mysql 需要帮助将子查询转换为JOIN的吗

有人能帮我把这个基于子查询的查询转换成JOIN的吗

SELECT DISTINCT brm_products_assets_id,
(select brm_products_assets_value from brm_products_assets_values where brm_products_assets_id=a.brm_products_assets_id and brm_products_assets_def_id=1) as prod_asset_name,
(select brm_products_assets_value from brm_products_assets_values where brm_products_assets_id=a.brm_products_assets_id and brm_products_assets_def_id=3) as prod_asset_desc,
(select brm_products_assets_value from brm_products_assets_values where brm_products_assets_id=a.brm_products_assets_id and brm_products_assets_def_id=2) as prod_asset_type,
ifnull((select brm_products_assets_value from brm_products_assets_values where brm_products_assets_id=a.brm_products_assets_id and brm_products_assets_def_id=5),'') as file_order 
from brm_products_assets a where last_mnt_option!='d';

此查询当前执行时间超过20秒。我尝试了一个有关brm_产品、资产和价值的指数，但没有帮助

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谢谢

您希望执行条件聚合，而不是单独的查询：

SELECT brm_products_assets_id,
       max(case when brm_products_assets_def_id = 1 then brm_products_assets_value
           end) as prod_asset_name,
       max(case when brm_products_assets_def_id = 2 then brm_products_assets_value
           end) as prod_asset_desc,
       max(case when brm_products_assets_def_id = 3 then brm_products_assets_value
           end) as prod_asset_type,
       max(case when brm_products_assets_def_id = 5 then brm_products_assets_value else ''
           end) as file_order
from brm_products_assets a join
     brm_products_assets_values b
     on b.brm_products_assets_id = a.brm_products_assets_id
where last_mnt_option <> 'd'
group by a.brm_products_assets_id;