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 ...

description: This article helps you resolve performance problems that occur in SQL Server 2014 and later versions when you compile your queries using the new cardinality estimator. ms.date: 08/12/2022 ...

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 ...

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 ...