I'm using MS-Access 2003 with the query creator. I select everything from one table (FaitsSaillants), then one specific row (WHERE VARIABLE='TitreMandat') from another table (tb_SOMMAIRE). I want to select another row from that second table and concatenate it.
The query
PARAMETERS
[CurrAxe] Text ( 255 ), [CurrOTP] Text ( 255 ),
[CurrClient] Text ( 255 ), [StartDate] DateTime, [EndDate] DateTime;
SELECT
tb_SOMMAIRE.Valeur AS Projet, tb_SOMMAIRE.VARIABLE, *
FROM
(FaitsSaillants
LEFT JOIN Employes
ON FaitsSaillants.Utilisateur = Employes.CIP)
INNER JOIN tb_SOMMAIRE
ON FaitsSaillants.OTP = tb_SOMMAIRE.OTP
WHERE
(((FaitsSaillants.OTP)=[CurrOTP]) AND
((FaitsSaillants.Client) Like [CurrClient]) AND
((FaitsSaillants.Axe) Like [CurrAxe]) AND
((DateValue([DateInsertion]))>=[StartDate] AND
(DateValue([DateInsertion]))<=[EndDate]) AND
((tb_SOMMAIRE.VARIABLE)='TitreMandat'))
ORDER BY
FaitsSaillants.DateInsertion DESC;
This query does add the tb_SOMMAIRE.Valeur field where the IDs (OTP field) match and where tb_SOMMAIRE.VARIABLE='TitreMandat'. It works like a charm. However, I want to add another row to the tb_SOMMAIRE results. I would like to get the row where VARIABLE='TitreMandat' (that part is actually working) and the row where VARIABLE='NomInstallation'. I will get 2 rows and I want those 2 rows to be concatenated and displayed when I ask for Projet (tb_SOMMAIRE.Value as Projet). Both rows' OTP (IDs) are the same as the one selected in FaitsSaillants.
Sorry if it's in French.
Tables' structure
FaitsSaillants
Index AutoNumber Projet Text Axe Text Client Text OTP Text FaitSaillant Memo DateInsertion Date Utilisateur Text
tb_SOMMAIRE
OTP Text VARIABLE Text Valeur Text
Data example
tb_SOMMAIRE
OTP VARIABLE Valeur UGPSW NomInstallation PosteNemiscau UGPSW TitreMandat oscilloperturbographe UGPSW RespIng CU9656 GWIHK NomInstallation AnotherInstallation GWIHK TitreMandat Anytitle GWIHK Responsable ImportantPerson
How about:
PARAMETERS [CurrAxe] TEXT ( 255 ), [CurrOTP] TEXT ( 255 ), [CurrClient] TEXT (
255 ), [StartDate] DATETIME, [EndDate] DATETIME;
SELECT q.Projet, *
FROM (faitssaillants f
LEFT JOIN employes e
ON f.utilisateur = e.cip)
INNER JOIN (
SELECT s1.otp,
[s1].[valeur] & "," & [s2].[valeur] AS Projet
FROM (
SELECT otp, valeur
FROM tb_sommaire
WHERE [variable] = 'TitreMandat') AS s1
INNER JOIN (
SELECT otp, valeur
FROM tb_sommaire
WHERE [variable] = 'NomInstallation') AS s2
ON s1.otp = s2.otp) q
ON f.otp = q.otp
WHERE f.otp = [currotp]
AND f.client LIKE [currclient]
AND f.axe LIKE [curraxe]
AND Datevalue([dateinsertion])
Between [startdate] And [enddate]
ORDER BY f.dateinsertion DESC;
It is always best to avoid referencing all fields as *. Fields (columns) should be listed by name.
The above depends on creating a derived table that groups rows from tb_sommaire by Otp. You can cut and paste the derived table into a query design screen (sql view) to check that the rows returned are as expected.
来源：https://stackoverflow.com/questions/13158913/concatenate-2-rows-in-a-complex-sql-query