variable can't change in fuction after mysql query

Question

i couldn't find any working solution to this problem i want to update mi queryResult variable.

But when i do console.log(queryResult) outside of function it gives me like 50 lines of information about query but when i do console.log in function it print object with data what i need.

var queryResult;
con.query('SELECT * FROM topics;', (err, result, fields) =>{
queryResult = result;
return queryResult
});
console.log(queryResult)