sql - how to join two string columns into one in MySQL -

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i have table

________________ | authors       | |name  | surname| |------|--------| |jeff  | lindsay| |george| martin | |______|________|

and need join these 2 columns 1 space between them. tried 

select (name + ', ' + surname) name authors

but returns me this:

 ________________ |    name       | |      0        | |      0        | |_______________|

how join these 2 have full name?

in mysql called concat

select concat(name,' ',surname) fullname author

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