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MS Access Query joining to Max record in another table

Experts,

I'm trying to query two tables,
1. An employee base record table (_Ebase) (contains no duplicates)
2. An employee personal information table (ePerson)

ePerson has multiple records per employee because a new record is created every time they change address,  but I only want the latest record from the ePerson side.

For the full data set, I would join the tables on the eBase table unique ID for the employee (called FlxID in this system) where eBase.ebflxID = ePerson.epFlxIdEb (the Eb suffix means its the foreign key for EbFlxID)

How do I set up the query to only pull
1. Everyone from the eBase side
2. but only the last record from the ePerson side for each employee?

Intuitively, it would be the Max of the unique ID for the table (ePerson.EpFlxID) for each employee. I don't necessarily need the solution to be in Sql form (using the query design interface is fine also) but pasting the Sql here is easy to do so,

SELECT [_NRCEbase].EbFlxID, NRCEPerson.EpFlxID, [_NRCEbase].EbRecType, "19660" AS co, [_NRCEbase].EbClock AS id, "I" AS [Record Type], [_NRCEbase].EbLastName AS [Last Name], [_NRCEbase].EbFirstName AS [First Name], [_NRCEbase].EbMiddleName, Left([_NRCEbase]![EbSocNumber],3) & "-" & Mid([_NRCEbase]![EbSocNumber],4,2) & Right([_NRCEbase]![EbSocNumber],4) AS SSN, [_NRCEbase].EbDateBeg, NRCEPerson.EpDateBorn
FROM _NRCEbase INNER JOIN NRCEPerson ON [_NRCEbase].EbFlxID = NRCEPerson.EpFlxIDEb
WHERE ((([_NRCEbase].EbRecType)="EBAS"))
ORDER BY [_NRCEbase].EbLastName;

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0
Ron
Asked:
Ron
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1 Solution
 
COACHMAN99Commented:
try
SELECT Table1.Field1, qryMax.MaxOfscore
FROM Table1 INNER JOIN qryMax ON Table1.ID = qryMax.personID;

qrymax
SELECT Table2.personID, Max(Table2.score) AS MaxOfscore
FROM Table2
GROUP BY Table2.personID;
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COACHMAN99Commented:
sorry main query has a left join

SELECT Table1.Field1, qryMax.MaxOfscore
FROM Table1 LEFT JOIN qryMax ON Table1.ID = qryMax.personID;
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COACHMAN99Commented:
if you want the last record (as opposed to the highest score) do max on the id (which was defined as autonumber) and group by person id.
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Pawan KumarDatabase ExpertCommented:
Can you tell me what issue are you facing with the query you have written?
0
 
Pawan KumarDatabase ExpertCommented:
Try this  .. SOLUTION 1

SELECT r.* , S.EpDateBorn FROM 
(
	SELECT
	   `E`.EbFlxI`, S.EpFlxID, `E`.EbRecTyp`, `19660` AS co, `E`.EbCloc` AS id, `I` AS [Record Type],
	  `E`.EbLastNam` AS [Last Name], `E`.EbFirstNam` AS [First Name], `E`.EbMiddleNam`, Left(`E`![EbSocNumber],3)
	  & `-` & Mid(`E`!`EbSocNumber`,4,2) & Right(`E`!`EbSocNumber`,4) AS SSN, `E`.EbDateBe`
	  ,(SELECT MAX(EpFlxIDEb) MaxEpFlxIDEb
		FROM NRCEPerson N
		WHERE E.personID = N.personID
		) AS MaxEpFlxIDEb
	FROM
	  _NRCEbase E
)r INNER JOIN NRCEPerson re ON r.MaxEpFlxIDEb = re.EbFlxID

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or Solution 2..

SELECT
	   [E].EbFlxID, S.EpFlxID, [E].EbRecType, "19660" AS co, [E].EbClock AS id, "I" AS [Record Type],
	  [E].EbLastName AS [Last Name], [E].EbFirstName AS [First Name], [E].EbMiddleName, Left([E]![EbSocNumber],3)
	  & "-" & Mid([E]![EbSocNumber],4,2) & Right([E]![EbSocNumber],4) AS SSN, [E].EbDateBeg
	  ,(SELECT N.EpDateBorn
		FROM NRCEPerson N
		WHERE E.personID = N.personID
		ORDER BY N.EbFlxID DESC
		LIMIT 1
		) AS EpDateBorn
	FROM
	  _NRCEbase E

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Enjoy !!
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RonBudget AnalystAuthor Commented:
Will these approaches work if I need multiple columns, say 7 or 8, from the second table?

The task actually requires me to populate a template with 40 or so fields coming from 5 tables, 4 of of which are the many side of a 1 to many relationship. So, would it be better to create new queries for each of the 4 left joined tables that filter for only the records i need form those tables and then join them?
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Pawan KumarDatabase ExpertCommented:
Yes first method will work in that case. Added all columns from 2nd table. <below>

Yes you are correct about the second comment.

SELECT r.* , re.* FROM 
(
	SELECT
	   `E`.EbFlxI`, S.EpFlxID, `E`.EbRecTyp`, `19660` AS co, `E`.EbCloc` AS id, `I` AS [Record Type],
	  `E`.EbLastNam` AS [Last Name], `E`.EbFirstNam` AS [First Name], `E`.EbMiddleNam`, Left(`E`![EbSocNumber],3)
	  & `-` & Mid(`E`!`EbSocNumber`,4,2) & Right(`E`!`EbSocNumber`,4) AS SSN, `E`.EbDateBe`
	  ,(SELECT MAX(EpFlxIDEb) MaxEpFlxIDEb
		FROM NRCEPerson N
		WHERE E.personID = N.personID
		) AS MaxEpFlxIDEb
	FROM
	  _NRCEbase E
)r INNER JOIN NRCEPerson re ON r.MaxEpFlxIDEb = re.EbFlxID

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0
 
RonBudget AnalystAuthor Commented:
Thanks
0

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