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Flutter › SQLite & Local Databases (sqflite)

How do you properly perform a JOIN query in sqflite to combine genuinely related data stored across two or more separate distinct tables, such as combining orders together with their own individual customer information?

Intermediate

Answer

sqflite lets you execute genuinely raw SQL queries directly through its rawQuery method, which is genuinely necessary for more complex operations such as a JOIN query that combines rows from two or more genuinely separate related tables based on a shared matching column, such as properly joining an orders table together with a customers table based on a shared customer identifier, letting you retrieve genuinely combined, properly related data in just one single efficient query rather than needing to make several genuinely separate individual queries and then manually combine those separate results together completely yourself.
final results = await db.rawQuery('''
  SELECT orders.id, orders.total, customers.name
  FROM orders
  JOIN customers ON orders.customer_id = customers.id
''');
Real-world example An order management app uses a single JOIN query to efficiently retrieve every order together with its own corresponding customer name in just one single database round trip, rather than making several genuinely separate individual queries and then manually combining those results together themselves.

Common follow-ups: What genuinely different specific types of JOIN, such as INNER versus LEFT JOIN, exist and when would you genuinely use each one respectively?;How do you actually properly and safely pass parameters into a rawQuery call to avoid a genuine SQL injection vulnerability?