In the previous article, we learned that Oracle uses selectivity to determine how many rows may satisfy a predicate. However, Oracle does not make optimization decisions using percentages. Instead, ...

Starting with [!INCLUDE sql-server-2022], the Cardinality Estimation (CE) feedback is part of the intelligent query processing family of features and addresses suboptimal query execution plans for ...

SQL Server Cardinality: Understanding Data Relationships What is SQL Server Cardinality? SQL Server cardinality refers to the uniqueness of data values within a column. Simply put, it describes the ...

Part of the SQL Server 2022 blog series. Cardinality estimation (CE) is a process used by the query optimizer to estimate the number of rows returned by a query or sub-part of a query. These estimates ...

Union doesn't work the way it should. I always get the message " Cardinality violation: 1222 The used SELECT statements have a different number of columns " When I check the SQL statement returned I ...

Abstract: The deep learning-based cardinality estimation is a hot research topic in the field of database query optimization. The SQL query featurization has a direct impact on the quality of ...

With all the cheerleading and the steady drumbeat of new features being released to Azure, it’s easy to lose track of the many cool and valuable new features released in the on-premises version of SQL ...

InfluxData, the creator of the time series platform InfluxDB, is unveiling InfluxDB Clustered, the self-managed iteration of the company’s time series database for on-premises or private cloud ...