Ecto Query Patterns

Master Ecto's powerful Query DSL to build efficient, composable database queries. This skill covers the query syntax, filtering, joining, aggregation, preloading associations, and advanced query composition patterns.

Basic Query with from Macro

import Ecto.Query, only: [from: 2]

# Basic query using keyword syntax
query = from u in "users",
          where: u.age > 18,
          select: u.name

# Execute the query
MyApp.Repo.all(query)