Read operations in SQLite involve retrieving data from a database table. These operations allow you to fetch and query data stored in your database.

The most common way to read data from a SQLite database is by using the SQL SELECT statement. Here's a basic example:

This code executes an SQL query to retrieve all rows from the articles table. The execute method runs the query, and the fetchall() method collects the results as a list of tuples, with each tuple representing a row in the table. Finally, the retrieved records are printed to the console.

Refreshing Data Filtering Techniques

Let's refresh our memory on how to filter data during queries. This is important because, in this chapter and the following ones, we will be working with pre-existing data in the database.

Filtering Data

You can also filter data based on specific criteria using the WHERE clause in your SELECT query. For instance:

This query will retrieve records only where the author matches "John".

Retrieving Specific Columns

To retrieve specific columns instead of all columns, you can specify the column names in the SELECT statement:

This query will retrieve only the "title" and "author" columns for all records in the "articles" table.

Limiting the Number of Results

You can limit the number of results with the LIMIT clause. For example, to retrieve the first three records:

These are the basic concepts for performing read operations in SQLite. You can customize your SELECT queries to retrieve specific data from your database as needed.