MYSQL: Trying to count Property_IDs over a close_dt Interval - mysql

Question

select
pd.state AS StateName,
pd.county AS `County Name`,
CASE pc.close_dt WHEN pc.close_dt >= DATE(NOW() - INTERVAL 3 MONTH)
THEN COUNT(pd.property_id)
ELSE NULL
END AS `3 MONTH`,
CASE pc.close_dt WHEN pc.close_dt >= DATE(NOW() - INTERVAL 6 MONTH)
THEN COUNT(pd.property_id)
ELSE NULL
END AS `6 MONTH`
from resnet.property_details pd
join resnet.property_closings pc
on pd.property_id = pc.Property_id
GROUP BY pd.state,pd.county
I'm trying to get the interval of 3 months from today, 6 months from today for properties that have been closed.
I want it to look like the this:

Answer 1

You need conditional aggregation. In MySQL, you can do this as:
select pd.state AS StateName, pd.county AS `County Name`,
SUM(pc.close_dt >= CURDATE() - INTERVAL 3 MONTH) AS `3 MONTH`,
SUM(pc.close_dt >= CURDATE() - INTERVAL 6 MONTH) AS `6 MONTH`
from resnet.property_details pd join
resnet.property_closings pc
on pd.property_id = pc.Property_id
group by pd.state, pd.county;
Notes:
Your case syntax just doesn't make sense. You either have conditions (as case when <condition> or you have constants as case <column> when <value>). But not both.
date(now()) = CURDATE().
You don't need case expressions because MySQL treats booleans as integers in a numeric context. You can just "sum them up" to count the number of true values.
EDIT:
If you want 3-6 months, then you would do:
SUM(pc.close_dt >= CURDATE() - INTERVAL 6 MONTH AND
pc.close_dt < CURDATE() - INTERVAL 3 MONTH) AS `6 MONTH`