Соединение нескольких таблиц с левым / внешним соединением - PullRequest
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Соединение нескольких таблиц с левым / внешним соединением

0 голосов
/ 14 февраля 2019

Привет У меня проблемы с пониманием join с несколькими таблицами.Я пытаюсь получить все данные для каждой таблицы (Расписание, Прогноз, Идеал, Факт).В приведенном ниже запросе данные из vendor..ideal_labor будут опущены, если эти данные отсутствуют в edw..f_labor_dtl.Например, если нет данных с edw..f_labor_dtl в день '2019-02-07', запрос также будет пропущен с vendor..ideal_labor, даже если он имеет данные по '2019-02-07'.Это легко исправить, если у меня есть только 2 таблицы, соединяющие друг друга (используйте left/right join или full outer join).Здесь с несколькими таблицами я использую свою таблицу 3 измерений в качестве левого соединения (SB_Finance.dbo.d_Job_Detail, edw..d_date, edw..d_store).Это означает, что всегда будет день '2019-02-07' в edw..d_date.Как мог, когда я left join на edw..d_date, он работал как inner join на всей временной таблице? 

with 
fcst as (
    select
        DOB as business_date,
        unit as store_id,
        JobCode as job_code,
        sum(Hours) as Hours
    from vendor..HotSchedulesOptimalsForecast
    group by dob,unit,JobCode
),
schd as (
    select
        DOB as business_date,
        unit as store_id,
        JobCode as job_code,
        sum(ScheduledMinutes/60.0) as Hours
    from vendor..HotSchedulesScheduled
    group by dob,unit,JobCode   
),
ideal as (
    select
        business_date,
        store_id,
        job_code,
        sum(ideal_hrs) as Hours
    from vendor..ideal_labor
    group by business_date,store_id,job_code    
),
act as (
    select
        business_date,
        store_id,
        job_code,
        sum(ttl_hrs) as Hours
    from edw..f_labor_dtl
    group by business_date,store_id,job_code    
)
select
    d.business_date,
    d.f_year,
    d.f_period,
    d.week_period,
    d.week_year,
    d.week_ending,
    s.store_id,
    s.store_desc,
    s.rpt_concept,
    s.region,
    j.job_code,
    j.job_name,
    j.Cat_OPKPI,
    sum(schd.Hours) as Schd_Hrs,
    sum(fcst.Hours) as Fcst_Hrs,
    sum(act.Hours) as Actl_Hrs,
    sum(ideal.Hours) as Ideal_Hrs
from SB_Finance.dbo.d_Job_Detail j
    left join fcst on j.job_code = fcst.job_code
    left join schd on j.job_code = schd.job_code
    left join ideal on j.job_code = ideal.job_code
    left join act act on j.job_code = act.job_code
    left join edw..d_date d on d.business_date = fcst.business_date and d.business_date = schd.business_date and d.business_date = ideal.business_date and d.business_date = act.business_date
    left join edw..d_store s on s.store_id = fcst.store_id and s.store_id = schd.store_id and s.store_id = ideal.store_id and s.store_id = act.store_id
where
    is_closed = 0
    and f_year = 2019
    and Cat_OPKPI in ('Service','Culinary','Support','Janitorial')
group by
    d.business_date,d.f_year,d.f_period,d.week_period,d.week_year,d.week_ending,s.store_id,s.store_desc,s.rpt_concept,s.region,j.job_code,j.job_name,j.Cat_OPKPI

1 Ответ

0 голосов
/ 14 февраля 2019

Я нашел ответ после игры с join.Я использую cross join для всех таблиц измерений, а затем left join для подключения других таблиц данных. 

with 
fcst as (
    select
        DOB as business_date,
        unit as store_id,
        JobCode as job_code,
        sum(Hours) as Hours
    from vendor..HotSchedulesOptimalsForecast 
    group by dob,unit,JobCode
),
schd as (
    select
        DOB as business_date,
        unit as store_id,
        JobCode as job_code,
        sum(ScheduledMinutes/60.0) as Hours
    from vendor..HotSchedulesScheduled
    group by dob,unit,JobCode   
),
ideal as (
    select
        business_date,
        store_id,
        job_code,
        sum(ideal_hrs) as Hours
    from vendor..ideal_labor
    group by business_date,store_id,job_code    
),
act as (
    select
        business_date,
        store_id,
        job_code,
        sum(ttl_hrs) as Hours
    from edw..f_labor_dtl
    group by business_date,store_id,job_code    
), summary as (
select
    d.business_date,
    d.f_year,
    d.f_period,
    d.week_period,
    d.week_year,
    d.week_ending,
    s.store_id,
    s.store_desc,
    s.rpt_concept,
    s.region,
    j.job_code,
    j.job_name,
    j.Cat_OPKPI,
    isnull(sum(schd.Hours),0) as Schd_Hrs,
    isnull(sum(fcst.Hours),0) as Fcst_Hrs,
    isnull(sum(act.Hours),0) as Actl_Hrs,
    isnull(sum(ideal.Hours),0) as Ideal_Hrs
from SB_Finance.dbo.d_Job_Detail j
    cross join edw..d_date d
    cross join edw..d_store s
    left join fcst on j.job_code = fcst.job_code and d.business_date = fcst.business_date and s.store_id = fcst.store_id
    left join schd on j.job_code = schd.job_code and d.business_date = schd.business_date and s.store_id = schd.store_id
    left join ideal on j.job_code = ideal.job_code and d.business_date = ideal.business_date and s.store_id = ideal.store_id
    left join act on j.job_code = act.job_code and d.business_date = act.business_date and s.store_id = act.store_id

where
    is_closed = 0
    and d.f_year = 2019
    and Cat_OPKPI in ('Service','Culinary','Support','Janitorial')
group by
    d.business_date,d.f_year,d.f_period,d.week_period,d.week_year,d.week_ending,s.store_id,s.store_desc,s.rpt_concept,s.region,j.job_code,j.job_name,j.Cat_OPKPI
...