¿Cómo recuperar datos de varias tablas?

How to fetch data from multiple tables?

There are many ways to display data from more than one table. You can join tables or views by a common column. You can also merge data from two or more tables or views into a single column or create a subquery to retrieve data from several tables. You can use a SELECT statement to join columns in two or more tables.

The database view is created by following the SQL and it can be injected into a customized data migration with the raw SQL execution command. The next step is to create a Django model which maps to this view so we can use Django ORM to retrieve the data from the view.

PostgreSQL INNER JOIN

1. First, specify columns from both tables that you want to select data in the SELECT clause.
2. Second, specify the main table i.e., table A in the FROM clause.
3. Third, specify the second table (table B ) in the INNER JOIN clause and provide a join condition after the ON keyword.

Let’s examine the SELECT statement in more detail:

1. First, specify a select list that can be a column or a list of columns in a table from which you want to retrieve data.
2. Second, specify the name of the table from which you want to query data after the FROM keyword.

It looks like this, and in order to use it in the html page it has to have a key for each tuple. I’ve tried to get the columns name but they are only table columns without data. Below is my Code:

I need to retrieve data from multiple tables to display shop name, shop location, shop monthly sales volume (unit), monthly sales amount, and sales person name who take orders from the shop. My sample table example below: id total_price added_by_id (employee id) customer_id 1 42480 2 1 2 74920 3 2 3 21000 3 2 4 42480 2 1

And now we install our two main packages: Django and psycopg2 for connecting to a PostgreSQL database. Django already ships with SQLite which may actually be suitable for many organizations and for hobbyists, but we’re going to use Postgres instead. Furthermore, we’ll be using an older version of Django (current version is Django 2.1).

As a result our Post model will have a Foreign Key to Company. The beauty of Django is that it takes care of all the hard work for us that would normally go with creating database schemas from scratch — no need to explicitly create primary keys, no need for indexes or junction tables for many-to-many relationships.