class Model1(models.Model):

            date = models.DateTimeField(db_column='Date', primary_key=True, default='', max_length=40)
            data1 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data1',)
            data2 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data2',)
            class Meta:
                    managed = True
                    db_table = 'table1'
            def __str__(self):
            return '%s %s %s' % (str(self.date), self.data1, self.data2,)

    class Model2(models.Model):

            date = models.DateTimeField(db_column='Date', primary_key=True, default='', max_length=40)
            data1 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data1',)
            data2 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data2',)
            class Meta:
                    managed = True
                    db_table = 'table2'
            def __str__(self):
            return '%s %s %s' % (str(self.date), self.data1, self.data2,)

    class Model3(models.Model):

            date = models.DateTimeField(db_column='Date', primary_key=True, default='', max_length=40)
            data1 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data1',)
            data2 = models.CharField(max_length=40, default='NoData', blank=True, null=True, db_column='data2',)
            class Meta:
                    managed = True
                    db_table = 'table3'
            def __str__(self):
            return '%s %s %s' % (str(self.date), self.data1, self.data2,)

from app.models import Model1, Model2, Model3
from django.shortcuts import render

def Appview(request):
    template_name = 'app/app.html'

    Model1 = Model1.objects.all()
    Model2 = Model2.objects.all()
    Model3 = Model3.objects.all()
    return render(request, template_name, {'Model1': Model1})

<div class="table-responsive container">
      <table id = "table" class = "table table-sm table-hover" width="100%">
        <thead>
            <tr>
                <th>Date</th>
                <th>Data1</th>
                <th>Data2</th>
            </tr>
        </thead>

        <tbody>
            {% for data in Model1 %}
            <tr>
                <td>{{ data.date }}</td>
                <td>{{ data.data1 }}</td>
                <td>{{ data.data2 }}</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>