Ecto

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API Reference
- Modules
- Mix Tasks
Changelog for v3.x
Introduction
Getting Started
Embedded Schemas
- User Profile Example
Testing with Ecto
Cheatsheets
Basic CRUD
Associations
How-To's
Aggregates and subqueries
- Aggregates
- Subqueries
Composable transactions with Multi
- Composing with data structures
- Dependent values
Constraints and Upserts
Data mapping and validation
- Schemas are mappers
- Schemaless changesets
Dynamic queries
Multi tenancy with query prefixes
Multi tenancy with foreign keys
Self-referencing many to many
- People relationships
- Summary
Polymorphic associations with many to many
Replicas and dynamic repositories
Schemaless queries
- insert_all, update_all and delete_all
Test factories

Search documentation of Ecto

Ecto.SubQueryError exception (Ecto v3.12.5)

Raised at runtime when a subquery is invalid.