SQL文は2行を1つにマージする

Question

my sql-statement（SQL Server 2016）の結果では、2つの列（ "study_id"と "study_start"）を同じ値で2つ組み合わせて1つの行にしたいと思います。 3番目のセル（ "Id"）に最も高い値の行を保持します。任意の列（すなわち「APP_ID」または場合は、id 『「higest IDで行のDate_arrival）がNULLである、それは最低で行から値を取るべき』

を私は以下の結果を得る：。

 
Id  study_id study_start Code Expl  Desc  Startmonth App_id Date_arrival Efter_op Date_begin 
167262 878899   954 4.1 udd.ord Afbrudt feb  86666 21-06-2012  N   17-08-2012 
180537 878899   954  1 Afsluttet Afsluttet feb  NULL NULL   NULL  NULL 

そして、私はこの結果を取得したいと思います：

 
Id  study_id study_start Code Expl  Desc  Startmonth App_id Date_arrival Efter_op Date_begin 
180537 878899  954   1 Afsluttet Afsluttet feb  86666 21-06-2012  N   17-08-2012 

私の文は次のようになります。

SELECT dbo.PopulationStam_V.ELEV_ID AS id, 
dbo.PopulationStam_V.PERS_ID AS study_id, 
dbo.STUDIESTARTER.STUDST_ID AS study_start, 
dbo.Optagelse_Studiestatus.AFGANGSARSAG AS Code, 
dbo.Optagelse_Studiestatus.KORT_BETEGNELSE AS Expl, 
ISNULL((CAST(dbo.Optagelse_Studiestatus.Studiestatus AS varchar(20))), 'Indskrevet') AS 'Desc', 
dbo.STUDIESTARTER.OPTAG_START_MANED AS Startmonth, 
dbo.ANSOGNINGER.ANSOG_ID as App_id, 
dbo.ANSOGNINGER.ANKOMSTDATO AS Data_arrival', 
dbo.ANSOGNINGER.EFTEROPTAG AS Efter_op, 
dbo.ANSOGNINGER.STATUSDATO AS Date_begin 
FROM dbo.INSTITUTIONER 
INNER JOIN dbo.PopulationStam_V 
ON dbo.INSTITUTIONER.INST_ID = dbo.PopulationStam_V.SEMI_ID 
LEFT JOIN dbo.ANSOGNINGER 
ON dbo.PopulationStam_V.ELEV_ID = dbo.ANSOGNINGER.ELEV_ID 
INNER JOIN dbo.STUDIESTARTER 
ON dbo.PopulationStam_V.STUDST_ID_OPRINDELIG = dbo.STUDIESTARTER.STUDST_ID 
INNER JOIN dbo.UDD_NAVNE_T 
ON dbo.PopulationStam_V.UDDA_ID = dbo.UDD_NAVNE_T.UDD_ID 
INNER JOIN dbo.UDDANNELSER 
ON dbo.UDD_NAVNE_T.UDD_ID = dbo.UDDANNELSER.UDDA_ID 
LEFT OUTER JOIN dbo.PERSONER 
ON dbo.PopulationStam_V.PERS_ID = dbo.PERSONER.PERS_ID 
LEFT OUTER JOIN dbo.POSTNR 
ON dbo.PERSONER.PONR_ID = dbo.POSTNR.PONR_ID 
LEFT OUTER JOIN dbo.KønAlleElevID_V 
ON dbo.PopulationStam_V.ELEV_ID = dbo.KønAlleElevID_V.ELEV_ID 
LEFT OUTER JOIN dbo.Optagelse_Studiestatus 
ON dbo.PopulationStam_V.AFAR_ID = dbo.Optagelse_Studiestatus.AFAR_ID 
LEFT OUTER JOIN dbo.frafaldsmodel_adgangsgrundlag 
ON dbo.frafaldsmodel_adgangsgrundlag.ELEV_ID = dbo.PopulationStam_V.ELEV_ID 
LEFT OUTER JOIN dbo.Optagelse_prioriteterUFM 
ON dbo.Optagelse_prioriteterUFM.cpr = dbo.PopulationStam_V.CPR_NR 
AND dbo.Optagelse_prioriteterUFM.Aar = dbo.frafaldsmodel_adgangsgrundlag.optagelsesaar 
LEFT OUTER JOIN dbo.frafaldsmodel_stoettetabel_uddannelser AS fsu 
ON fsu.id_uddannelse = dbo.UDDANNELSER.UDDA_ID 
AND fsu.id_inst = dbo.INSTITUTIONER.INST_ID 
AND fsu.uddannelse_aar = dbo.frafaldsmodel_adgangsgrundlag.optagelsesaar 
WHERE dbo.STUDIESTARTER.STUDIESTARTSDATO > '2012-03-01 00:00:00.000' 
AND (dbo.Optagelse_Studiestatus.AFGANGSARSAG IS NULL 
OR dbo.Optagelse_Studiestatus.AFGANGSARSAG NOT LIKE '2.7.4') 
AND (dbo.PopulationStam_V.INDSKRIVNINGSFORM = '1100' 
OR dbo.PopulationStam_V.INDSKRIVNINGSFORM = '1700') 
GROUP BY dbo.PopulationStam_V.ELEV_ID, 
dbo.PopulationStam_V.PERS_ID, 
dbo.STUDIESTARTER.STUDST_ID, 
dbo.Optagelse_Studiestatus.AFGANGSARSAG, 
dbo.Optagelse_Studiestatus.KORT_BETEGNELSE, 
dbo.STUDIESTARTER.OPTAG_START_MANED, 
Studiestatus, 
dbo.ANSOGNINGER.ANSOG_ID, 
dbo.ANSOGNINGER.ANKOMSTDATO, 
dbo.ANSOGNINGER.EFTEROPTAG, 
dbo.ANSOGNINGER.STATUSDATO 

I本当に誰かが助けてくれることを願っています。

Answer 1

多くの方法、これは動作します：

WITH subSource AS (
/* Your query here */ 
) 
SELECT 
    s1.id, 
    /* all other columns work like this: 
    COALESCE(S1.column,s2.column) 
    for example: */ 
    coalesce(s1.appid,s2.appid) as appid 
FROM subSource s1 
INNER JOIN subSource s2 
ON s1.study_id =s2.study_id 
    and s1.study_start = s2.study_start 
    AND s1.id > s2.id 
    /* I imagine some other clauses might be needed but maybe not */ 

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