Question

我的SQL数据库中有以下表格，需要按ID和Time2对其进行分组，其中Time2 max on Time2

例如：

下表是我的目标：

Answer 1

如果你想要摆脱第二张图片中的线条，那些被划掉的线条，你可以简单地将GROUP BY time2。

或者，当有两个完全相同的时间时，你想获得最大时间1吗？然后就可以了

var authController = require('./app/controllers/authcontroller.js');
var auth = require('./app/routes/auth.js');

    var express    = require('express')
    var app        = express()
    var passport   = require('passport')
    var session    = require('express-session')
    var bodyParser = require('body-parser')
    var env        = require('dotenv').load()
    var exphbs     = require('express-handlebars')
    app.use(session({secret: 'ssshhhhh'}));
    app.use(passport.initialize())  
    app.use(passport.session()) 
    var  server = require('http').createServer(app);
    var io = require('socket.io').listen(server);
    var mysql = require('mysql');

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

    users = [];
    connections = [];

    app.use('/cssFiles', express.static('/opt/lampp/htdocs/x/regtest/using-passport-with-sequelize-and-mysql-master/app/routes/assets'));
    //For BodyParser
    app.use(bodyParser.urlencoded({ extended: true }));
    app.use(bodyParser.json());


     // For Passport
    app.use(session({ secret: 'keyboard cat',resave: true, saveUninitialized:true})); // session secret
    app.use(passport.initialize());
    app.use(passport.session()); // persistent login sessions
    //passport.authenticate('local-signin'); 

     //For Handlebars
    app.set('views', './app/views')
    app.engine('hbs', exphbs({extname: '.hbs'}));
    app.set('view engine', '.hbs');


    app.get('/', function(req, res){
      console.log('idddddd',req.sessionID);
      res.send('Welcome to Passport with Sequelize');

    });


    //Models
    var models = require("./app/models");


    //Routes
    var authRoute = require('./app/routes/auth.js')(app,passport);


    //load passport strategies
    require('./app/config/passport/passport.js')(passport,models.user);


    //Sync Database
    models.sequelize.sync().then(function(){
    console.log('Nice! Database looks fine')

    }).catch(function(err){
    console.log(err,"Something went wrong with the Database Update!")
    });





    server.listen(process.env.PORT || 5000, function(err){
        if(!err)
        console.log("Site is live"); else console.log(err)

    });




console.log('Server running...');
app.get('/', function(req, res){
    res.sendFile('/opt/lampp/htdocs/x/regtest/using-passport-with-sequelize-and-mysql-master/app/routes/page.html');

});
//connection.connect();

io.sockets.on('connection', module.exports = function(socket,client,req){
    //con
    connections.push(socket);
    //app.use(session);
    app.use(session({ secret: 'keyboard cat',resave: true, saveUninitialized:true})); // session secret
    app.use(passport.initialize());
    app.use(passport.session()); // persistent login sessions

    console.log('connected: %s socket connected session',socket.request.client.user ,connections.length);

按最长日期分组

1 个答案: