如何将两个 select 查询与不同的列组合起来

Question

我知道 union 可以合并两个具有相同数量和类型的列的查询。但是我有一个条件，我必须将两个 select 语句与不同的 table 和不同的列组合在一起，尽管 1 table 在两者中都很常见，即 PatientAppointment。以下是两个声明：

select p.CDRId, p.Gender,p.MRN,p.DoB as DOB,pa.AppointmentDateTime,cn.Description,ehv.ProgramName,
 cn.CreatedBy as CareTeamStaffMember,cn.Profile as Role,cn.Title as Credentials,
 date_format(pa.AppointmentDateTime, '%Y-%m') BillingMonth,
 ((case when duration like '% hour%' then substring_index(duration, ' hour', 1) * 60 else 0 end) +
(case when duration like '%min%' then substring_index(substring_index(duration, ' min', 1), ' ', -1) + 0 else 0 end)) as minutes
from Patient p inner join EnrollmentHistoryView ehv on ehv.CDRId = p.CDRId
inner join ClinicalNote cn on cn.CDRId = p.CDRId
inner join PatientAppointment pa on pa.CDRId = p.CDRId 
where p.CDRId='9493b505-03b9-46a0-b009-99b34f7a5d41' 
and ehv.ProgramName!='N/A'
group by p.CDRId, p.Gender, p.MRN, p.Dob, pa.AppointmentDateTime,cn.Description,cn.CreatedBy,cn.Profile,cn.Title,pa.Duration,ehv.ProgramName

联盟

SELECT AppointmentDateTime,
       duration,
       minutes,
       CASE WHEN @prev_month != BillingMonth
            THEN total >= 20
            WHEN @prev_total < 20 
            THEN 1
            ELSE 0 
            END 99457Elig,
       CASE WHEN @prev_month != BillingMonth
            THEN total >= 40
            WHEN @prev_total < 40
            THEN 1
            ELSE 0 
            END 99458Elig,
       @prev_month := BillingMonth BillingMonth,
       @prev_total := total total
FROM (select AppointmentDateTime,
             duration,
             @cur_dur := ((case when duration like '% hour%' then substring_index(duration, ' hour', 1) * 60 else 0 end) +
                         (case when duration like '%min%' then substring_index(substring_index(duration, ' min', 1), ' ', -1) + 0 else 0 end)) as minutes,

             CASE WHEN @year_month = date_format(AppointmentDateTime, '%Y-%m')
                  THEN @cum_sum := @cum_sum + @cur_dur
                  ELSE @cum_sum := @cur_dur
                  END total,
             @year_month := date_format(AppointmentDateTime, '%Y-%m') BillingMonth

      from PatientAppointment, (SELECT @year_month:='', @cum_sum:=0, @cur_dur:=0) variables
      ORDER BY AppointmentDateTime) subquery,
(SELECT @prev_month:=0, @prev_total:=0) variable
ORDER BY AppointmentDateTime

查询太复杂，我也无法创建数据集。请帮助我的方法。至少给我一些建议。我自己试试。

Answer 1

将您的第一个查询视为 Query1，将第二个查询视为 Query2，您可以在这两个查询之间使用简单连接。

如你所说 PatientAppointment table 在两者中都很常见，使用它的主键（CDRId）作为这两者之间的连接。所以你的查询看起来像。

SELECT * 
FROM ( Query1 ) AS table1
INNER JOIN ( Query2) AS table2 ON table1.CDRId = table2.CDRId;

如何将两个 select 查询与不同的列组合起来

How to combine two select query with different columns

mysql

sql

mysql-5.7