sql语句查询时间的方式比较（代码实例）

sql语句查询时间的方式比较（代码实例）

select
    e.id as "id",
    e.enterprise_name as "enterprisename",
    y.industry_name as "industryname",
    d.district_name as "districtname",
    v.level_value as "levelvalue",
    v.sumscore as "sumscore"
from
    
        (
            (
                enterprise e
                left join industry y on e.industry_id = y.id
            )
            left join district d on e.district_id = d.id
        )


        left join 

                (
                        select i.enterprise_id,sum(i.index_score) sumscore,l.level_value  from index_enterprise_year i left join level_enterprise_year l on i.enterprise_id = l.enterprise_id
                        and l. year = i.year where  i.year=2017 group by i.enterprise_id 
                )  v 

        on  e.id=v.enterprise_id
where 
    e.enterprise_status = 10
order by sumscore desc
limit 10

select
    e.id as "id",
    e.enterprise_name as "enterprisename",
    e.business_registration_no as "businessregistrationno",
    e.organization_code as "organizationcode",
    e.unified_credit_code as "unifiedcreditcode",
    e.legal_person_name as "legalpersonname",
    e.enterprise_telephone as "enterprisetelephone",
    e.registered_address as "registeredaddress",
    e.longitude as "longitude",
    e.dimension as "dimension",
    e.industry_id as "industryid",
    y.industry_name as "industryname",
    e.district_id as "districtid",
    d.district_name as "districtname",
    e.formula_id as "formulaid",
    e.enterprise_status as "enterprisestatus",
    sum(i.index_score) sumscore,
    l.level_value
from
    (
        (
            (
                enterprise e
                left join industry y on e.industry_id = y.id
            )
            left join district d on e.district_id = d.id
        )
        left join level_enterprise_year l on e.id = l.enterprise_id
        and l. year = 2017
    )
left join index_enterprise_year i on e.id = i.enterprise_id
and i. year = 2017
group by
    e.id
having
    e.enterprise_status = 10
order by
    sumscore desc
limit 10

两条语句时间相差75倍,了解下原因