mysql select values as column from another table

Question

It's hard to give a title to this question but much easier to understand by showing the structure of tables:

There are 2 tables below:

Table A:

idA(int)	label(json)
1001	[1, 3]
1002	[3, 2]

Table B:

idB(int)	name(string)
1	apple
2	orange
3	strawberry
...	...

Require outputs:

idA	apple	orange	strawberry
1001	1	0	1
1002	0	1	1

how to use mysql query to get this?

Answer 1

select 
    a.idA,
    SUM(CASE b.name WHEN 'apple' THEN 1 ELSE 0 END)  apple,
    SUM(CASE b.name WHEN 'orange' THEN 1 ELSE 0 END)  orange,
    SUM(CASE b.name WHEN 'strawberry' THEN 1 ELSE 0 END)  strawberry
from a 
left join b on  FIND_IN_SET(b.idB,a.label)
group by    a.idA

• My mysql version is low and there is no json type. I hope this will help you!

Answer 2

Try selecting from both tables together since you can't join them - select t1.*, t2.* from table1 t1, table2 t2