SQL

SQL is the primary interface for DeltaStream. Using a simple and familiar SQL interface, you can

• create databases

• run continuous queries

• build materialized views

• and more

DeltaStream also provides SQL extensions that enable you to express streaming concepts that don’t have equivalents in traditional SQL.

DDL

SQL DDLs are queries that create, delete, or modify database structures. Unlike queries, DDLs do not process any data. Examples of useful DDLs include:

• creating databases

• creating streams

• dropping entities

• updating stores.

DDLs are useful in both the DeltaStream UI and the CLI. However, the UI also provides an interface for many of these DDLs, such as creating stores.

For a full list of SQL DDLs, go to the DDL page of the SQL Syntax section.

Query

There are two main types of SQL queries that actually process data:

1. Streaming or continuous queries

2. Materialized view queries

We cover both in the Query page under Core Concepts.

When you write streaming queries in the UI, successful queries display in the Query tab. Interactive streaming queries and queries on materialized views print results on the page. Similarly, for the CLI you can list successful streaming queries with the LIST QUERIES command; interactive streaming queries and queries on materialized views print results directly in the console.

For a full list of SQL queries, go to the Query section under SQL Syntax.

Command

SQL commands are actions that do not change database entities and do not process data. Examples of useful commands include:

• listing and describing DeltaStream entities

• inviting users to your organization

• granting privileges

• printing the records in entities

SQL commands are useful when using the CLI. DeltaStream provides the functionality of these commands through its UI.

For a full list of SQL commands, go to the Commands section under SQL Syntax.