Cardinality estimation is a key component in query optimization. To choose the best executing plan, the query optimizer should precisely estimate the selectivity of a SQL predicate -- the number of ...

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 ...

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 ...

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 ...

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 ...

Cardinality estimation is widely believed to be one of the most important causes of poor query plans. Prior studies evaluate the impact of cardinality estimation on plan quality on a set of ...

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 ...