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lets learn about Union statement in MySQL so what union does is it is used to add rules to the existing table so the difference between union and join is is join joins the two tables horizontally meaning it joins the record from one table and attaches it horizontally in Union instead of attaching it horizontally think of inserting rows at the bottom of the table so it is appending values at the bottom of the table now to do that you will use a keyword called union now when you use the keyword Union it will always return distinct values but if you want default values or if you want to see all the values the keyword that you are going to use is going to be Union all now here is an example again we have uh two tables so the first table is the customer table where there are three customers John Doe Jane Myers and Mike Daniels they live in the city of Mumbai Delhi and Bangalore the second table is the employee table we again we have three employees one zero one one zero two one zero three
