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+# Database guides
+
+## Tooling
+
+- [Understanding EXPLAIN plans](../understanding_explain_plans.md)
+- [explain.depesz.com](https://explain.depesz.com/) or [explain.dalibo.com](https://explain.dalibo.com/) for visualizing the output of `EXPLAIN`
+- [pgFormatter](http://sqlformat.darold.net/) a PostgreSQL SQL syntax beautifier
+
+## Migrations
+
+- [What requires downtime?](../what_requires_downtime.md)
+- [SQL guidelines](../sql.md) for working with SQL queries
+- [Migrations style guide](../migration_style_guide.md) for creating safe SQL migrations
+- [Testing Rails migrations](../testing_guide/testing_migrations_guide.md) guide
+- [Post deployment migrations](../post_deployment_migrations.md)
+- [Background migrations](../background_migrations.md)
+- [Swapping tables](../swapping_tables.md)
+- [Deleting migrations](../deleting_migrations.md)
+
+## Debugging
+
+- Tracing the source of an SQL query using query comments with [Marginalia](../database_query_comments.md)
+- Tracing the source of an SQL query in Rails console using [Verbose Query Logs](https://guides.rubyonrails.org/debugging_rails_applications.html#verbose-query-logs)
+
+## Best practices
+
+- [Adding database indexes](../adding_database_indexes.md)
+- [Foreign keys & associations](../foreign_keys.md)
+- [Adding a foreign key constraint to an existing column](add_foreign_key_to_existing_column.md)
+- [`NOT NULL` constraints](not_null_constraints.md)
+- [Strings and the Text data type](strings_and_the_text_data_type.md)
+- [Single table inheritance](../single_table_inheritance.md)
+- [Polymorphic associations](../polymorphic_associations.md)
+- [Serializing data](../serializing_data.md)
+- [Hash indexes](../hash_indexes.md)
+- [Storing SHA1 hashes as binary](../sha1_as_binary.md)
+- [Iterating tables in batches](../iterating_tables_in_batches.md)
+- [Insert into tables in batches](../insert_into_tables_in_batches.md)
+- [Ordering table columns](../ordering_table_columns.md)
+- [Verifying database capabilities](../verifying_database_capabilities.md)
+- [Database Debugging and Troubleshooting](../database_debugging.md)
+- [Query Count Limits](../query_count_limits.md)
+- [Creating enums](../creating_enums.md)
+
+## Case studies
+
+- [Database case study: Filtering by label](../filtering_by_label.md)
+- [Database case study: Namespaces storage statistics](../namespaces_storage_statistics.md)