UNION syntax of SQL is'nt working !!😭😭. Why??

Question

I have two tables .
1st named [ Humans ].
2nd named [ Users ].

This is the syntax I used to get UNION of the table but it is giving number of errors.

Select * from Users UNION select * from Humans ;

The output is not coming.
If coming , not as wanted.. totally different.

Please help me out.
Exams near.😞😞

I can't make you understand whole here. Please you may refer to the code below.
It will make you clear

https://code.sololearn.com/WUh1eH5r7QdP/?ref=app

Answer 1

union is trying to make a report with 7 fields and 18 data records. sounds like you want 9 records with 9 fields (Id First_Name Last_Name Age Future Salary Hobbies Class Blood_group). Try:
SELECT *
FROM Humans
INNER JOIN Users ON Humans.Id=Users.Id;

Answer 2

John Wells . Tables have Id column which is same in both .. but how there is nothing similar. I don't understand. please can you tell me.
I want to do union of two tables so what I would required

Answer 3

I have no clue what output you are expecting to get and without an example can't really help you. As far as I can tell, those tables have nothing to do with each other. Their structure is completely different and union requires similar structures.