How to insert data from 4 queries into one table when the 4 queries have data that are not unique?

Question

to be more clear I have these kind of data.

Query 1) Data from 2016

Item       Price        Quantity

Shoe        20             10
Shoe        30            


        

Answer 1

Try this as just an idea-

SELECT Item,
SUM(Price2016),SUM(Quantity2016),
SUM(Price2017),SUM(Quantity2017),
SUM(Price2018),SUM(Quantity2018),
SUM(Price2019),SUM(Quantity2019)
FROM
(
    SELECT Item, 
    Price Price2016, Quantity  Quantity2016,
    NULL Price2017,NULL   Quantity2017  
    NULL Price2018,NULL   Quantity2018   
    NULL Price2019, NULL  Quantity2019
    FROM 2016

    UNION ALL

    SELECT Item, 
    NULL Price2016, NULL Quantity2016,
    Price Price2017,Quantity Quantity2017  
    NULL Price2018,NULL   Quantity2018   
    NULL Price2019, NULL  Quantity2019
    FROM 2017

    UNION ALL

    SELECT Item, 
    NULL Price2016, NULL  Quantity2016,
    NULL Price2017,NULL   Quantity2017  
    Price Price2018,Quantity   Quantity2018   
    NULL Price2019, NULL  Quantity2019
    FROM 2018

    UNION ALL

    SELECT Item, 
    NULL Price2016, NULL Quantity2016,
    NULL Price2017,NULL   Quantity2017  
    NULL Price2018,NULL   Quantity2018   
    Price Price2019, Quantity Quantity2019
    FROM 2019
)A
GROUP BY Item