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Courses
What are the courses?

Video courses covering Apache Kafka basics, advanced concepts, setup and use cases, and everything in between.

Learning pathways (24)
New Courses
NewDesigning Event-Driven Microservices
NewApache Flink® 101
NewBuilding Flink® Apps in Java
NewHybrid and Multicloud Architecture
NewMastering Production Data Streaming Systems with Apache Kafka®
Featured Courses
Kafka® 101
Kafka® Connect 101
Kafka Streams 101
Schema Registry 101
ksqlDB 101
Data Mesh 101
Learn
Pick your learning path

A wide range of resources to get you started

Start Learning
Articles

Deep-dives into key concepts
Patterns

Architectures for event streaming
FAQs

Q & A about Kafka® and its ecosystem
Blog

The Confluent blog
NewLearn More

Our podcast, Streaming Audio
Build
Design. Build. Run.

Build a client app, explore use cases, and build on our demos and resources

Start Building
Language Guides

Build apps in your favorite language
Tutorials

Hands-on stream processing examples
Demos

More resources to get you started
Community
Join the Community

Confluent proudly supports the global community of streaming platforms, real-time data streams, Apache Kafka®️, and its ecosystems

Learn More
Meetups & Events

Kafka and data streaming community
Ask the Community

Community forums and Slack channels
Community Catalysts

Sharing expertise with the community
DevX Newsletter

Bi-weekly newsletter with Apache Kafka® resources, news from the community, and fun links.
Data Streaming Awards

Nominate amazing use cases and view previous winners
NewCommunity Use Cases

Real-world Examples of Apache Kafka® and Flink® in action
NewKafka Summit 2024 - Bangalore

Register now!
NewKafka Summit 2024 - London
NewCurrent 2024
Current 2023

View sessions and slides from Current 2023
Kafka Summit 2023

View sessions and slides from Kafka Summit 2023
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  1. Home
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  3. Process Data with Confluent Cloud for Apache Flink
  4. Flink SQL and Table API Reference for Confluent Cloud for Apache Flink
  5. SQL Functions in Confluent Cloud for Apache Flink

CLOUD

  • Overview
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    • Overview
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    • Tutorials and Examples
      • Overview
      • Example: Use Replicator to Copy Kafka Data to Cloud
      • Example: Create Fully-Managed Services
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  • Manage Kafka Clusters
    • Overview
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      • Overview
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        • Share Data Across Clusters, Regions, and Clouds
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      • Configure, Manage, and Monitor
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      • Example: Autogenerate Self-Managed Component Configs for Cloud
  • Build Client Applications
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            • Overview
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        • Manage Identity Providers
          • Overview
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            • Overview
            • Add an OIDC identity provider
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          • Manage mTLS Identity Providers
            • Overview
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    • Control Access
      • Overview
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        • Overview
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          • Overview
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        • Overview
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    • Encrypt and Protect Data
      • Overview
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        • Overview
        • Use Self-managed Encryption Keys on AWS
        • Use Self-managed Encryption Keys on Azure
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        • Use Confluent CLI for Self-managed Encryption Keys
        • Use BYOK API for Self-managed Encryption Keys
        • Revoke Access to Data at Rest
        • Best Practices
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        • Overview
        • Manage Client-side Field Level Encryption
        • Use Client-side Field Level Encryption
        • Configuration Settings
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    • Monitor Activity
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        • Connector
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        • Networking
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        • Organization
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        • Role-based Access Control (RBAC)
        • Schema Registry Authentication and Authorization
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      • Access and Consume Audit Log Records
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      • Best Practices
      • Troubleshoot
    • Access Management Tutorial
    • Complete Environment Tutorial
  • Manage Topics
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    • Work With Topics
    • Message Browser
    • Share Streams
      • Overview
      • Provide Stream Shares
      • Consume Stream Shares
  • Govern Data Streams
    • Overview
    • Stream Governance
      • Packages, Features, and Limits
      • Data Portal
      • Track Data with Stream Lineage
      • Manage Stream Catalog
        • Stream Catalog User Guide
        • REST API Catalog Usage and Examples Guide
        • GraphQL API Catalog Usage and Examples Guide
    • Manage Schemas
      • Overview
      • Manage Schemas
      • Delete Schemas and Manage Storage
      • Use Broker-Side Schema ID Validation
      • Schema Linking
      • Schema Registry Tutorial
    • Fundamentals
      • Key Concepts
      • Schema Evolution and Compatibility
      • Schema Formats
        • Serializers and Deserializers Overview
        • Avro
        • Protobuf
        • JSON Schema
      • Data Contracts
      • Security Considerations
      • Private Networking
    • Reference
      • Configure Clients to Schema Registry
      • Schema Registry REST API Usage Examples
      • Use AsyncAPI to Describe Topics and Schemas
      • Maven Plugin
    • FAQ
  • Connect to External Systems
    • Overview
    • Install Connectors
      • ActiveMQ Source
      • AlloyDB Sink
      • Amazon CloudWatch Logs Source
      • Amazon CloudWatch Metrics Sink
      • Amazon DynamoDB Sink
      • Amazon DynamoDB CDC Source
      • Amazon Kinesis Source
      • Amazon Redshift Sink
      • Amazon S3 Sink
        • Configure and Launch
        • Configure with AWS Egress PrivateLink Endpoints
      • Amazon S3 Source
      • Amazon SQS Source
      • AWS Lambda Sink
      • Azure Blob Storage Sink
        • Configure and Launch
        • Configure with Azure Egress Private Link Endpoints
      • Azure Blob Storage Source
      • Azure Cognitive Search Sink
      • Azure Cosmos DB Sink
      • Azure Cosmos DB Source
      • Azure Data Lake Storage Gen2 Sink
      • Azure Event Hubs Source
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      • Databricks Delta Lake Sink
        • Set up Databricks Delta Lake (AWS) Sink Connector for Confluent Cloud
        • Configure and launch the connector
      • Datadog Metrics Sink
      • Datagen Source (development and testing)
      • Elasticsearch Service Sink
      • GitHub Source
      • Google BigQuery Sink (Legacy)
      • Google BigQuery Sink V2
      • Google Cloud BigTable Sink
      • Google Cloud Dataproc Sink
      • Google Cloud Functions Gen 2 Sink
      • Google Cloud Functions Sink (Legacy)
      • Google Cloud Pub/Sub Source
      • Google Cloud Spanner Sink
      • Google Cloud Storage Sink
      • Google Cloud Storage Source
      • HTTP Sink
      • HTTP Sink V2
      • HTTP Source
      • HTTP Source V2
      • IBM MQ Source
      • InfluxDB 2 Sink
      • InfluxDB 2 Source
      • Jira Source
      • Microsoft SQL Server CDC Source (Debezium) [Legacy]
      • Microsoft SQL Server CDC Source V2 (Debezium)
        • Configure and launch the connector
        • Backward incompatibility considerations
      • Microsoft SQL Server Sink (JDBC)
      • Microsoft SQL Server Source (JDBC)
      • MongoDB Atlas Sink
        • Configure and Launch
        • Configure with AWS Egress PrivateLink Endpoints
        • Configure with Azure Egress Private Link Endpoints
      • MongoDB Atlas Source
      • MQTT Sink
      • MQTT Source
      • MySQL CDC Source (Debezium) [Legacy]
      • MySQL CDC Source V2 (Debezium)
        • Configure and Launch the connector
        • Backward Incompatible Changes
      • MySQL Sink (JDBC)
      • MySQL Source (JDBC)
      • New Relic Metrics Sink
      • OpenSearch Sink
      • Oracle CDC Source
        • Overview
        • Configure and Launch the connector
        • Horizontal Scaling for Oracle CDC Source Connector for Confluent Cloud
        • Oracle Database Prerequisites for Oracle CDC Source Connector for Confluent Cloud
        • SMT Examples
        • DDL Changes
        • Troubleshooting
      • Oracle Database Sink (JDBC)
      • Oracle Database Source (JDBC)
      • PagerDuty Sink
      • Pinecone Sink
      • PostgreSQL CDC Source (Debezium) [Legacy]
      • PostgreSQL CDC Source V2 (Debezium)
        • Configure and Launch the connector
        • Backward Incompatible Changes
      • PostgreSQL Sink (JDBC)
      • PostgreSQL Source (JDBC)
      • RabbitMQ Sink
      • RabbitMQ Source
      • Redis Sink
      • Salesforce Bulk API 2.0 Sink
      • Salesforce Bulk API 2.0 Source
      • Salesforce Bulk API Source
      • Salesforce CDC Source
      • Salesforce Platform Event Sink
      • Salesforce Platform Event Source
      • Salesforce PushTopic Source
      • Salesforce SObject Sink
      • ServiceNow Sink
      • ServiceNow Source
      • SFTP Sink
      • SFTP Source
      • Snowflake Sink
        • Configure and Launch
        • Configure with AWS Egress PrivateLink Endpoints
        • Configure with Azure Egress Private Link Endpoints
      • Solace Sink
      • Splunk Sink
      • Zendesk Source
    • Confluent Hub
      • Overview
      • Component Archive Specification
      • Contribute
    • Install Custom Plugins and Custom Connectors
      • Overview
      • Quick Start
      • Manage Custom Connectors
      • Limitations and Support
      • API and CLI
    • Manage Provider Integration
      • Quick Start
      • Provider Integration APIs
    • Networking and DNS
      • Overview
      • AWS Egress PrivateLink Endpoints for First-Party Services
      • AWS Egress PrivateLink Endpoints for RDS & Self-Managed Services
      • Azure Egress Private Link Endpoints for First-Party Services
      • Azure Egress Private Link Endpoints for Self-Managed Services
    • Confluent Cloud API for Managed and Custom Connectors
    • Manage Public Egress IP Addresses
    • Preview Connector Output
    • Configure Single Message Transforms
    • View Connector Events
    • Manage Service Accounts
    • Configure RBAC
    • View Errors in the Dead Letter Queue
    • Connector Limits
    • Manage Offsets
    • Transforms List
      • Overview
      • Cast
      • Drop
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      • Eventrouter
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      • Filter (Kafka)
      • Filter (Confluent)
      • Flatten
      • Gzipdecompress
      • Headerfrom
      • Hoistfield
      • Insertfield
      • Insertheader
      • Maskfield
      • Messagetimestamprouter
      • Regexrouter
      • Replacefield
      • Setschemametadata
      • Timestampconverter
      • Timestamprouter
      • Tombstonehandler
      • Topicregexrouter
      • Valuetokey
  • Process Data with Flink
    • Overview
    • Get Started
      • Overview
      • Quick Start with Cloud Console
      • Quick Start with SQL Shell in Confluent CLI
      • Quick Start with Java Table API
      • Quick Start with Python Table API
    • Concepts
      • Overview
      • Compute Pools
      • Autopilot
      • Statements
      • Determinism
      • Tables and Topics
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      • Delivery Guarantees and Latency
      • Comparison with OSS Flink
    • How-To Guides
      • Overview
      • Aggregate a Stream in a Tumbling Window
      • Convert the Serialization Format of a Topic
      • Compare Current and Previous Values in a Stream
      • Mask Fields in a Table
      • Deduplicate Rows in a Table
      • Scan and Summarize Tables
      • Handle Multiple Event Types
      • Create a UDF
      • Process Schemaless Events
    • Operate and Deploy
      • Overview
      • CLI Commands
      • Create a Compute Pool
      • Monitor Statements
      • Grant Role-Based Access
      • Billing
      • Deploy a Statement with CI/CD
      • Generate a Flink API Key
      • REST API
      • Move SQL Statements to Production
      • Enable Private Networking
    • Flink SQL Reference
      • Overview
      • SQL Syntax
      • DDL Statements
        • Statements Overview
        • ALTER MODEL
        • ALTER TABLE
        • CREATE FUNCTION
        • CREATE MODEL
        • CREATE TABLE
        • DESCRIBE
        • DROP MODEL
        • HINTS
        • EXPLAIN
        • RESET
        • SET
        • SHOW
        • USE CATALOG
        • USE database_name
      • DML Statements
        • Queries Overview
        • Deduplication
        • Group Aggregation
        • INSERT INTO FROM SELECT
        • INSERT VALUES
        • Joins
        • LIMIT
        • Pattern Recognition
        • ORDER BY
        • OVER Aggregation
        • SELECT
        • Set Logic
        • Statement Set
        • Top-N
        • Window Aggregation
        • Window Deduplication
        • Window Join
        • Window Top-N
        • Window Table-Valued Function
        • WITH
      • Functions
        • Flink SQL Functions in Confluent Cloud for Apache Flink
        • Aggregate
        • Collections
        • Comparison
        • Conditional
        • Datetime
        • Hashing
        • JSON
        • AI Model Inference
        • Numeric
        • String
        • Table API
      • Data Types
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      • Time Zone
      • Keywords
      • Information Schema
      • Example Streams
      • Supported Cloud Regions
      • SQL Examples
      • Table API
    • Get Help
  • Build AI with Flink
    • Overview
    • Run an AI Model
  • Process Data with ksqlDB
    • Create Stream Processing Apps with ksqlDB
    • Enable ksqlDB Integration with Schema Registry
    • ksqlDB Cluster API Quick Start
    • Monitor ksqlDB
    • Manage ksqlDB by using the CLI
    • Manage Connectors With ksqlDB
    • Develop ksqlDB Applications
    • Pull Queries
    • Quick Start
    • Grant Role-Based Access
    • Migrate ksqlDB Applications on Confluent Cloud
    • Build Data Pipelines with Stream Designer
      • Stream Designer for Confluent Cloud
      • Quick Start for Stream Designer
      • Create a Join Pipeline
      • Create an Aggregation Pipeline
      • Import a Recipe Into a Pipeline
      • Import and Export a Pipeline
      • Edit and Update a Pipeline
      • Role-Based Access Control for Pipelines
      • Troubleshoot a Pipeline in Stream Designer
      • Manage Pipelines With the CLI
      • Manage Pipelines With the REST API
      • Manage Pipeline Secrets
  • Manage Networking
    • Overview
    • Networking on AWS
      • Overview
      • Public Networking on AWS
      • Confluent Cloud Network on AWS
      • PrivateLink on AWS
        • Overview
        • PrivateLink for Dedicated Clusters
        • PrivateLink for Serverless Instances
        • Egress PrivateLink for Dedicated Clusters
      • VPC Peering on AWS
      • Transit Gateway on AWS
    • Networking on Azure
      • Overview
      • Public Networking on Azure
      • Confluent Cloud Network on Azure
      • Private Link on Azure
        • Overview
        • Private Link for Dedicated Clusters
        • Private Link for Enterprise Clusters
        • Egress Private Link for Dedicated Clusters
      • VNet Peering on Azure
    • Networking on Google Cloud
      • Overview
      • Public Networking on Google Cloud
      • Confluent Cloud Network on Google Cloud
      • Private Service Connect on Goole Cloud
      • VPC Peering on Google Cloud
    • Connectivity for Confluent Resources
      • Overview
      • Public Egress IP Address for Connectors and Cluster Linking
      • Cluster Linking using AWS PrivateLink
      • Follower Fetching using AWS VPC Peering
    • Use Confluent Cloud with Private Networking
    • Test Connectivity
  • Log and Monitor
    • Audit Logs
      • Concepts
      • Understand Audit Log Records
      • Audit Log Event Schema
      • Auditable Event Methods
        • Connector
        • Custom connector plugin
        • Flink
        • Flink Authentication and Authorization
        • IP Filter Authorization
        • Kafka Cluster Authentication and Authorization
        • Kafka Cluster Management
        • ksqlDB Cluster Authentication and Authorization
        • Networking
        • Notifications Service
        • OAuth/OIDC Identity Provider and Identity Pool
        • Organization
        • Pipeline (Stream Designer)
        • Role-based Access Control (RBAC)
        • Schema Registry Authentication and Authorization
        • Schema Registry Management and Operations
      • Access and Consume Audit Log Records
      • Retain Audit Logs
      • Best Practices
      • Troubleshoot
    • Metrics
    • Manage Notifications
    • Monitor Consumer Lag
    • Monitor Dedicated Clusters
      • Monitor Cluster Load
      • Manage Performance and Expansion
      • Track Usage by Team
    • Observability for Kafka Clients to Confluent Cloud
  • Manage Billing
    • Overview
    • Marketplace Consumption Metrics
    • Use AWS Pay As You Go
    • Use AWS Commits
    • Use Azure Pay As You Go
    • Use Azure Commits
    • Use Google Cloud Pay As You Go
    • Use Google Cloud Commits
    • Marketplace Organization Suspension and Deactivation
  • Manage Service Quotas
    • Overview
    • Service Quotas
    • View Service Quotas using Confluent CLI
    • Service Quotas API
  • APIs
    • Confluent Cloud APIs
    • Kafka Admin and Produce REST APIs
    • Connect API
    • Provider Integration API
    • Flink REST API
    • Metrics API
    • Stream Catalog REST API Usage
    • GraphQL API
    • Service Quotas API
    • Stream Designer Pipelines API
  • Confluent CLI
  • Release Notes & FAQ
    • Release Notes
    • FAQ
    • Upgrade Policy
    • Compliance
    • Generate a HAR file for Troubleshooting
    • Confluent AI Assistant
  • Support
  • Glossary

Flink SQL Functions in Confluent Cloud for Apache Flink¶

Confluent Cloud for Apache Flink®️ enables you to do data transformations and other operations with the following built-in functions.

  • Aggregate Functions
  • Collection Functions
  • Comparison Functions
  • Conditional Functions
  • Datetime Functions
  • Hash Functions
  • JSON Functions
  • Numeric Functions
  • String Functions

Related content¶

  • Flink SQL Queries
  • DDL Statements

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