Compare values ​​in duplicate tables
P粉811329034
P粉811329034 2023-09-13 08:52:32
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I have a query that generates a table of duplicate records from a larger data set, and I would like to be able to perform further analysis on this output data.

Below is an example that can be used.

I would like to be able to identify, for each property, instances where the property's oldest rating was below 50 but the latest rating is now greater than 70.

In the example below, only ratings related to attribute 17 meet this condition, so the row containing Reference jygh will be extracted.

refer to Attribute address date score
Adev Attribute 12 2022-12-08 70
Pout Attribute 12 2022-12-16 90
mhef Properties 17 2023-01-02 25
jygh Properties 17 2023-01-09 70
boy Property 22 2022-10-05 85
qepl Property 22 2022-10-25 28

This is a specialized analysis of change over time, so a max/min comparison of ratings alone is not sufficient.

Edit: I edited the data example to show the rating value decreasing, which does not meet the criteria.

P粉811329034
P粉811329034

reply all(2)
P粉141925181

This method only works if the date is not taken into account:

select PROPERTYADDRESS
from TABLE1
where RATING <= 50
and PROPERTYADDRESS in (
 select PROPERTYADDRESS
 from TABLE1
 where RATING >= 70
);

Check it out here: https://dbfiddle.uk/6yoRNP74

P粉068510991

This will consider the oldest and newest rates:

SELECT mt.PROPERTYADDRESS    
FROM TABLE1 mt 
INNER JOIN
    (
        SELECT PROPERTYADDRESS, MIN(Date) AS MinDate
        FROM TABLE1
        GROUP BY PROPERTYADDRESS
    ) t ON mt.PROPERTYADDRESS = t.PROPERTYADDRESS AND mt.DATE = t.MinDate
 WHERE RATING <= 50
 AND mt.PROPERTYADDRESS in (
     SELECT mt.PROPERTYADDRESS 
     FROM TABLE1 mt 
     INNER JOIN
        (
            SELECT PROPERTYADDRESS, MAX(Date) AS MaxDate
            FROM TABLE1
            GROUP BY PROPERTYADDRESS
        ) t ON mt.PROPERTYADDRESS = t.PROPERTYADDRESS AND mt.DATE = t.MaxDate
     WHERE RATING >= 70
);

Check here: https://dbfiddle.uk/XzEIlvKc

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