ClickHouse supports user-defined functions (UDF) that can either be created based on the built-in functions in ClickHouse or from an external script or program. ClickHouse uses STDIN and STDOUT data streams to communicate with the […]
Map data type in ClickHouse is used to store key-value pairs in table columns. A key-value pair consists of two data elements that are related. Let us look at an example for creating a table […]
Introduction ClickHouse is a well-known, lightning-fast columnar data store. ClickHouse is primarily used for storing analytical data in tabular format. With the recent advancements in AI and Machine learning, there is a rapid increase in […]
Introduction The latest Long Term Support version of ClickHouse was released on 31 August (23.8 LTS). ClickHouse has two LTS releases every year (March and August) and this latest release has a lot of bug […]
Introduction Amazon Redshift is a proprietary cloud data warehouse offered by AWS. It is based on PostgreSQL but with modifications. Amazon RedShift is an OLAP data store, whereas PostgreSQL is an OLTP database system. […]
Introduction BigQuery is Google’s fully managed data warehouse which is offered with its own SQL dialect support. BigQuery was launched in the year 2011 and has been a mature cloud offering ever since. BigQuery is […]
Projections in ClickHouse are commonly used to speed up the queries on the MergeTree table at the cost of storage. The speedup achieved is due to how the data is stored (different from the original […]
Live Views in ClickHouse stores the result of the query used to create the view and it is different from a normal view which doesn’t store any data in it. The data stored for a […]
ClickHouse creates a user named ‘default’, at the time of installation/fresh deployment. This default user has unrestricted access to the data in the cluster and we can also provide access management privilege in the users.xml […]
Introduction Snowflake is a fully managed SaaS (Software as a service) used for data warehousing, data engineering, data lakes, and data science applications. Snowflake is a proven cloud-based data platform, and it is one of […]
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