var sqlite3 = require('sqlite3').verbose();
var db = new sqlite3.Database(':memory:');

db.serialize(function() {
  db.run("CREATE TABLE lorem (info TEXT)");

  var stmt = db.prepare("INSERT INTO lorem VALUES (?)");
  for (var i = 0; i < 10; i++) {
      stmt.run("Ipsum " + i);
  }
  stmt.finalize();

  db.each("SELECT rowid AS id, info FROM lorem", function(err, row) {
      console.log(row.id + ": " + row.info);
  });
});

db.close();

    var sqlite3 = require('sqlite3').verbose();
    var db = new sqlite3.Database(':memory:', function() {
          db.registerFunction('A_PLUS_B', function(a, b) {
              return a+b;
          });
          
          db.all('SELECT A_PLUS_B(1, 2) AS val', function(err, rows) {
              console.log(row.id + ": " + row.info); //Prints [{val: 3}]
          });
          
          db.close();
    });
    

    var sqlite3 = require('sqlite3').verbose();
    var db = new sqlite3.Database(':memory:', function() {
          let tempStr = '';
          db.registerAggregateFunction('CUSTOM_AGGREGATE', function(value) {
              if(!value){
                  return tempStr;
              }
              tempStr+= value;
          });
          
          db.all('SELECT CUSTOM_AGGREGATE(id) AS val', function(err, rows) {
              console.log(row.id + ": " + row.info); //Prints [{val: '123456'}] if table has 6 rows with id field
          });
          
          db.close();
    });