Require result with of multiple customers along with city name - postgresql

Question

we have following requirement
I need customer_name which are in Active status and attribute_name=City and attribute_value in(Indore,Mumbai) and result should return count less than=2
It means from result for Indore i should get 2 results out of 3 and for Mumbai i should get 1 out of 1.
I tried below 2 ways but getting all the rows for customers which are in city Indore and Mumbai
Customer_table has below details
customer_id customer_name customer_Status
------------------------------------------
1 ABC Active
2 XYZ Active
3 PQR NA
4 ABCD Active
4 ABCDE Active
customer_details table has below details
customer_id attribute_name attribute_value
------------------------------------------
1 City Indore
1 Phone Number 9100000000
1 Country India
2 City Mumbai
2 Phone Number 9100000001
2 Country India
3 City Delhi
3 Phone Number 9100000002
3 Country India
4 City Mumbai
4 Phone Number 9100000003
4 Country India
5 City Mumbai
5 Phone Number 9100000004
5 Country India
Code:-
select attribute_value, r.customer_name from customer_details res
join lateral (
select customer_name from Customer_table
where res.customer_id=customer_id
and customer_Status= 'Active'
limit 2
) r on true
where attribute_name= 'City' and attribute_value in ('Indore','Mumbai');
Code:-
SELECT s.customer_name,attribute_value
FROM (
SELECT *, row_number() OVER (PARTITION BY customer_id ) AS rn
FROM customer_details
WHERE attribute_name= 'City' and attribute_value in ('Indore','Mumbai')
) e
JOIN Customer_table s USING (customer_id)
WHERE rn <= 2
and and customer_Status= 'Active'
ORDER BY customer_id, e.rn;

Answer 1

Please try this way.
select customer_name,attribute_value from (
select ct.customer_name,attribute_value,row_number() OVER (PARTITION BY attribute_value ) AS rn
from customer_table ct ,customer_details cd
where ct.customer_status = 'Active' and ct.customer_id = cd.customer_id
and attribute_name='City' and attribute_value in('Indore','Mumbai')
) as t
where rn <= 2

Answer 2

This design will kill any performance you hope to get around customers. The first thing I would do in drop the customer_details table and the columns phone_number, city, and country to the customers table. Lacking that I would create a view that joined customers to customer_details having all the columns in the view.
create view Customer_Standard as
select c.cust_id, c.name, c.status, ph.attribute_value phone_number, ct.attribute_value city, cn.attribute_value country
from customers c
left join customer_details ph on (ph.cust_id = c.cust_id and ph.attribute_name = 'Phone Number')
left join customer_details ct on (ct.cust_id = c.cust_id and ct.attribute_name = 'City')
left join customer_details cn on (cn.cust_id = c.cust_id and cn.attribute_name = 'Country') ;
Then the query you want becomes:
select cust_id, name, status, phone_number, city, country
from (select cs.*, row_number() over (partition by city order by cust_id) rn
from Customer_Standard cs
) cust
where city in ('Indore','Mumbai')
and rn<3;