mysql - how to join tables and 2 select together -

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i have following 2 queries, how can join them together?

query1:

select product_name, count(product_name) count_product_name ps_order_detail id_shop = 1 group product_name order count_product_name desc limit 5

query2:

select count(*) count, concat(decade, '-', decade + 9) year (select floor(year(`birthday`) / 10) * 10 decade       ps_customer) c group decade;

the first query top 5 product name ordered most.

the second query customer birthday year , group them every ten years.

i want know age group order top 5 product.

result should be

product name, years, count producta 1990-2009  100 producta 2000-2019  20 productb 1980-1999  20 productb 1990-2009  25 productb 2000-2019  20

...

i have third table have connection.

create table ps_orders(   id_customer, id_order );  create table ps_customer( id_customer, birthday ); create table ps_order_detail( id_order, product_name );

i not sure how put them together, can input product name 1 one years. 

select count(*) count, concat(decade, '-', decade + 9) year  (select floor(year(birthday) / 10) * 10 decade        ps_customer cu,             ps_orders o,             ps_order_detail od        cu.id_customer = o.id_customer          , o.id_order = od.id_order          , od.product_name = 'product name a'      ) c     group decade;

use second query, instead of specifying particular product, put grouping. join subquery returns top 5 products limit it.

select product_name, concat(decade, '-', decade + 9) year, count(*) count (select p.product_name, floor(year(birthday) / 10) * 10 decade       (select product_name, count(*) count_product_name             ps_order_detail             id_shop = 1             group product_name             order count_product_name desc             limit 5) p       join ps_order_detail od on od.product_name = p.product_name       join ps_orders o on o.id_order = od.id_order       join ps_customer c on c.id_customer = o.id_customer       od.id_shop = 1) x group product_name, decade

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