# Flink SQL Examples in Confluent Manager for Apache Flink The following examples are complete, runnable walkthroughs for Flink SQL in Confluent Manager for Apache Flink® (CMF). Each one starts from an artifact or a `CREATE TABLE` and ends with real query output, so you can follow along on your own cluster and confirm the result. They build on the concepts in [User-Defined Functions](../user-defined-functions.md#cmf-sql-udf) and [Custom Connectors and Formats](../custom-connectors.md#cmf-sql-custom-connectors). ## Examples - [Redact a Column with a User-Defined Function](udf.md#cmf-sql-example-udf): register a scalar Java function and call it in a query to redact a column. - [Round-Trip an Apache Iceberg Table](iceberg.md#cmf-sql-example-iceberg): load the Apache Iceberg™ connector as an artifact and run a full write-then-read round trip against object storage. - [Read CSV Files from Object Storage](filesystem.md#cmf-sql-example-filesystem): read CSV files from object storage with the filesystem connector. - [Read and Write MongoDB](mongodb.md#cmf-sql-example-mongodb): write to and read from MongoDB with the off-the-shelf `flink-sql-connector-mongodb` connector. ## Before you begin Complete the one-time [environment setup](setup.md#cmf-sql-examples-setup) first. It installs object storage, enables artifact management and the environment catalog, and creates an environment named `test` and a compute pool named `pool`. The examples submit statements with the `confluent` CLI and the CMF REST API against that environment and pool at `http://cmf:8080`. Substitute your own environment, pool, and endpoint. Each example lists any extra setup it needs.