我想结合两个 nodejs 程序以获得一个结果：按类型过滤的特定 CSV 数据 - 如何正确结合代码？

Question

我的 CSV 数据中有三种类型的客户，我只想显示 Type1... 我已经编写了两个单独的代码，但我想将它们合并为一个：

这个是过滤特定列的：

var mysql = require('mysql');
var con = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "private",
    database: "private"
});

con.connect(function(err) {
  if (err) throw err;
  con.query("SELECT customernumber, type, gender, name, streetapt, city, state, zip, phone, discount, outstandingbalance FROM customers", function (err, result, fields) {
    if (err) throw err;
    console.log(result);
  });
});

这个是按TYPE过滤的：

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : 'private',
  database : 'private'
});
connection.connect();

connection.query('SELECT type, COUNT(type) FROM icedcoffee.customers group by type', function(err, rows, fields) 
{
  if (err) throw err;
  console.log(rows[1]);
  console.log(rows[0]);
  console.log(rows[2]);
});

connection.end();

Answer 1

这将显示客户中每一行的计数类型

SELECT customernumber, c.type, gender, name, streetapt, city, state, zip, phone, discount, outstandingbalance, t1.ctype 
FROM customers c INNER JOIN (SELECT type, COUNT(type) ctype FROM icedcoffee.customers group by type) t1  ON c.type = t1.type
WHERE c.type = 1