Union function

Question

Please help me understand this
How the values will be unioned? If it is

https://code.sololearn.com/clFHU1dakbPc/?ref=app

https://code.sololearn.com/cvUO2NkOP81b/?ref=app

Answer 1

the commands that you need are in this piece of code.

https://paiza.io/en/languages/mysql

copy this code and see the result

https://code.sololearn.com/cBsjgwEcFyi9

Answer 2

SoloProg PLEASE HELP!!