What is the difference between synchronous and asynchronous programming (in node.js)

Question

I\'ve been reading nodebeginner And I came across the following two pieces of code.

The first one:

    var result = database.query(\"SELECT * FROM hu         


        

Answer 1

In the synchronous case, the console.log command is not executed until the SQL query has finished executing.

In the asynchronous case, the console.log command will be directly executed. The result of the query will then be stored by the "callback" function sometime afterwards.