Question​

If I have varying attributes in a column using map types, how can I extract them and use them in queries?

Question​

How do I set up ClickHouse with a Docker image to connect to Microsoft SQL Server?

Question​

How do I work with JSON message using a source or landing table to extract with a Materialized View?
How do I work with JSON without the experimental JSON Object?

This example shows how AD users that belong to different AD security groups can be given role access in ClickHouse. It also shows how a user may be added to multiple AD user groups so they can have access provided by multiple roles.

Overview: This article walks through the process of sending data from a Kafka topic to a ClickHouse table. We’ll use the Wiki recent changes feed, which provides a stream of events that represent changes made to various Wikimedia properties. The steps include:

1. How to setup Kafka on Ubuntu
2. Ingest a stream of data into a Kakfa topic
3. Create a ClickHouse table that subscribes to the topic

In order to build and contribute to ClickHouse, you must use LLVM and Clang.

This is useful when there are tables that have similar naming conventions and similar columns but are not replicated. An example is searching the system database for entries in the query log tables.

Dictionaries created in ClickHouse Cloud may experience inconsistency during the initial creation phase. This means that you may not see any data in the dictionary right after creation. However, after several retries, the creation query may land on different replicas, and data will be visible.

Question​

How can I backup a specific partition in ClickHouse?

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I'm writing data into ClickHouse cloud and need to be able ,when reading data, to guarantee that I'm getting the latest complete information.