course: ksqlDB 101

Hands On: Transforming Data with ksqlDB

2 min
Allison WaltherIntegration Architect (Course Presenter)

Hands On: Transforming Data with ksqlDB

Continuing with the orders stream from previous exercises, this exercise teaches you how to transform data in ksqlDB.

Query an Existing Stream and Inspect the Data

  1. Begin by selecting everything from the orders stream:


    Click Run query.

  2. Scroll down to see the returned records. View the structure of one of the records by clicking on the caret in its upper left-hand corner.


    Now Stop your orders query.

Create a Persistent Transformation

  1. Create a persistent transformation with no address data:

    CREATE STREAM orders_no_address_data AS
    SELECT TIMESTAMPTOSTRING(ordertime, 'yyyy-MM-dd HH:mm:ss') AS order_timestamp, orderid, itemid, orderunits

Inspect the Transformed Stream

  1. Now select from the transformed stream:

    SELECT * FROM orders_no_address EMIT CHANGES;

    Click Run query.

    Expand the record to see the transformed data.

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