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Get most recent record from one-to-many relationship


Get most recent record from one-to-many relationship

By : user2172785
Date : October 22 2020, 08:10 PM
help you fix your problem As I say in the title, having this schema: , I would suggest a correlated subquery:
code :
select v.*
from visits v
where v.date = (select max(v2.date)
                from visits v2
                where v2.services_id = v.services_id
               );


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Best approach: get the most recent N-side Record on a SQL Query on a N-1 relationship

Best approach: get the most recent N-side Record on a SQL Query on a N-1 relationship


By : user3287394
Date : March 29 2020, 07:55 AM
may help you . I could also simply join the two tables, ordering in descencing way the st.DateTimeStatus and limiting the result to 1.
I think you would be hard-pressed to find a more performant option than this.
Getting most recent record and if the most recent doesn't qualify get the previous record

Getting most recent record and if the most recent doesn't qualify get the previous record


By : R. Azachi
Date : March 29 2020, 07:55 AM
like below fixes the issue Am new to sql, Am stuck at one point in one of my sql queries.My question is , there are multiple visit dates for a person where he has to qualify for some conditions.I have to pull most recent qualifying visit and if the most recent visit doesn't satisfy the conditions then it should pick the previous visit which qualify's. ex: , I think you can try this:
code :
    SELECT NAME
    ,VISIT_DT
    ,X
    ,Y
    ,Z
FROM (
    SELECT *
        ,ROW_NUMBER() OVER (
            PARTITION BY NAME ORDER BY X + Y DESC
                ,VISIT_DT DESC
            ) AS RN
    FROM MYTABLE
    ) B
WHERE RN = 1
NAME                        VISIT_DT                X           Y           Z
--------------------------- ----------------------- ----------- ----------- -----------
A                           2017-04-27 00:00:00.000 1           1           0
B                           2017-04-24 00:00:00.000 1           1           0
C                           2017-04-23 00:00:00.000 1           0           0
How to create a has_many relationship record which won't error if the relationship record already exists in Rails 5?

How to create a has_many relationship record which won't error if the relationship record already exists in Rails 5?


By : Stearz
Date : March 29 2020, 07:55 AM
To fix this issue I have the following Rails 5 models setup: , job_title.job_title_skills.find_or_create_by(skill: skill)
Find most recent record from "has one through" relationship

Find most recent record from "has one through" relationship


By : user1188627
Date : March 29 2020, 07:55 AM
Does that help I have the following tables:
code :
SELECT finalValues.* FROM
matrix_values AS finalValues
INNER JOIN matrix_value_products AS finalProducts 
ON finalProducts.matrix_value_id = finalValues.id
AND finalValues.created_at = (
    SELECT max(created_at) 
    FROM matrix_values 
    INNER JOIN matrix_value_products
    ON matrix_values.id = matrix_value_products.matrix_value_id
    WHERE matrix_value_products.product_id = finalProducts.product_id
)   
WHERE
        matrix_id = 777
How to show only most recent record in relationship in SQL?

How to show only most recent record in relationship in SQL?


By : cowglow
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can get the most recent tag per pet by using a subquery in the WHERE clause to match to the most recent year:
code :
SELECT . . .
FROM tblPetOwners INNER JOIN
     (tblPets LEFT JOIN
      tblePetTags 
      ON tblPets.[ID] = tblePetTags.[Pet]
     ) ON tblPetOwners.ID = tblPets.PETOWNER 
WHERE tblPets.DESIGNATION NOT IN ( "Deceased", "Disowned", "Moved" ) AND
      tblePetTags.TagYear = (SELECT MAX(pt2.TagYear)
                             FROM tblePetTags as pt2
                             WHERE pt2.Pet = tblePetTags.Pet
                            );
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