Query multiple records from table using derived field - mysql

Question

I'm working on a legacy database system which deals with property reports and I am attempting to update a query which shows multiple reports within a time period for the same address. I am using MySQL Workbench to run this query.
The table has a UPRN field for unique addresses, which is fine, however addresses can be manually added without a UPRN. The table also has address1, address2, address3, town, postcode fields. There is NO field which contains the whole address as one line.
We already have a query which uses the UPRN field to generate a list of multiple records within a timescale; however, this will obviously exclude multiple reports without a UPRN.
SELECT * FROM
`rep_base_report` `rep`
WHERE
`rep`.`UPRN` IN (SELECT
`rep2`.`UPRN` AS `UPRN`
FROM
`rep_base_report` `rep2`
WHERE
`rep2`.`STATUS` = 'LODGED'
AND `rep2`.`GENERATED_DATE` > (CURDATE() - INTERVAL 3 MONTH)
GROUP BY `rep2`.`UPRN`
HAVING (COUNT(0) > 1)
ORDER BY `rep2`.`GENERATED_DATE` DESC)
GROUP BY `rep`.`RepReference`
ORDER BY `rep`.`UPRN`
In my head, if I could CONCAT address1, address2 and postcode and use this as the basis for the check, it would give the appropriate output, but I've no idea how to accomplish this.
I've attempted the following but it's giving fewer values that I was expect (I've manually checked some sample data in Excel to see what I should be expecting).
SELECT *
FROM `rep_base_report` `rep`
WHERE
#property :=CONCAT(`rep`.`ADDRESS1`, ' ' ,`rep`.`ADDRESS2`, ' ' ,`rep`.`POSTCODE`) IN (
SELECT #property2 :=CONCAT(`rep2`.`ADDRESS1`, ' ' ,`rep2`.`ADDRESS2`, ' ' ,`rep2`.`POSTCODE`) AS `PROPERTY`
FROM `rep_base_report` `rep2`
WHERE `rep2`.`STATUS` = 'LODGED'
AND `rep2`.`GENERATED_DATE` > CURDATE() - INTERVAL 3 MONTH
GROUP BY #property2
HAVING COUNT(0) > 1
ORDER BY `rep2`.`GENERATED_DATE` DESC
)
GROUP BY `rep`.`RepReference`
ORDER BY `rep`.`UPRN`

Answer 1

SELECT *
FROM `rep_base_report` `rep`
WHERE
CONCAT(`rep`.`ADDRESS1`, ' ', `rep`.`ADDRESS2`, ' ', `rep`.`POSTCODE`) IN (
SELECT CONCAT(`rep2`.`ADDRESS1`, ' ', `rep2`.`ADDRESS2`, ' ', `rep2`.`POSTCODE`) AS `PROPERTY`
FROM `rep_base_report` `rep2`
WHERE `rep2`.`STATUS` = 'LODGED'
AND `rep2`.`GENERATED_DATE` > CURDATE() - INTERVAL 3 MONTH
GROUP BY CONCAT(`rep2`.`ADDRESS1`, ' ', `rep2`.`ADDRESS2`, ' ', `rep2`.`POSTCODE`)
HAVING COUNT(0) > 1
ORDER BY `rep2`.`GENERATED_DATE` DESC
)
GROUP BY `rep`.`RepReference`
ORDER BY `rep`.`UPRN`