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Editorial Team
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Asked: 2026-06-02T20:17:52+00:00

This is the table structure (the relevant bits): I’m trying to find the contactLog

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This is the table structure (the relevant bits):

Basic table structure

I’m trying to find the contactLog entries that match the declarations on clientID and the date of the declaration (within 8 hours actually). Here’s what I came up with:

SELECT
D.ClientID
D.DeclarationID   
CL.ContactDescription,
CL.ContactDate,

FROM Declarations D

INNER JOIN  (Contacts C
         INNER JOIN (PartialContacts PC
             INNER JOIN ContactLogs CL
                ON PC.ContactPartID = CL.ContactPartID )
            on PC.ContactID = C.ContactID
     )  
    ON C.ClientID = D.ClientID AND DATEDIFF(hour, D.DeclarationDate, CL.ContactDate) < 8

However, the join is not functioning properly, because I get non matching dates back for the CL.ContactDate and it’s clear that it’s just return every row in CL for that patient ID. I think… I’m not really sure what is going wrong.

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1 Answer

  1. Editorial Team

    Thanks to Damien:

    I did not specify a lower limit for datediff, so the matching did not work properly. Apperently, the joins are just fine:

    SELECT
D.ClientID
D.DeclarationID   
CL.ContactDescription,
CL.ContactDate,

FROM Declarations D

INNER JOIN  (Contacts C
         INNER JOIN (PartialContacts PC
             INNER JOIN ContactLogs CL
                ON PC.ContactPartID = CL.ContactPartID )
            on PC.ContactID = C.ContactID
     )  
    ON C.ClientID = D.ClientID AND DATEDIFF(hour, D.DeclarationDate, CL.ContactDate) < 8 DATEDIFF(hour, D.DeclarationDate, CL.ContactDate) > 0.1
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