Concatenate of a string and a number

Dear statalister,

I am trying to merge to database, I would like to try using a concatenate of country and year, first is a string and the second a number. Are there any function or command to do it? I tested strcat and something else I found in the fórum but one is for two strings and the second for two numbers.
Thank you for your kind help.

Best regards,
Alejandro