Databases Estimated Rows Very Wrong

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Databases: Wrong estimated row count
Databases: Query using a filtered index but wrong estimated number of rows
Databases: Wrong estimated number of rows using TOP condition
SESSION: Skewed Data, Poor Cardinality Estimates, and Plans Gone Bad (Kimberly Tripp)
Estimate vs Actual Number of Rows
Databases: Estimated row size and estimated data size is incorrect
Databases: Optimizer gets the wrong number of estimated rows even with updated stats
SQL Server's "Wrong" Math
Finding Bad Density Vector Estimates In SQL Server

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Last Updated: June 20, 2026

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SQL Server's "Wrong" Math

Sometimes SQL queries that include numerical calculations can produce some unintended results. This week we look at...