Part 2 on PERSISTED and performance shows the other side: when non-persisted computed columns give better performance than PERSISTED ones.
SQL SERVER – Computed Column – PERSISTED and Performance
My computed column series in one list: PERSISTED versus non-persisted for storage and speed, and how an index on the column improves performance.
Relational Division in T-SQL: Customers Who Bought Every Product
Solve relational division with counts and double NOT EXISTS, then handle duplicates, NULL values, empty requirements, and exact matching.
SQL SERVER – Introduction to BINARY_CHECKSUM and Working Example
BINARY_CHECKSUM helps detect changes in a row. My working example shows how it works and why it misses a value changed from A to B and back to A.
geometry STDifference: Keep the Subtraction Direction
geometry STDifference is directional. Two overlapping equal-area rectangles can produce equal remaining areas while retaining entirely different regions.
SQL SERVER – Check Advanced Server Configuration
How do you Check Advanced Server Configuration values? Turn on show advanced options with sp_configure, run RECONFIGURE, then run sp_configure to list them.
SQL SERVER – Computed Column – PERSISTED and Storage
How a computed column is created and why PERSISTED and storage go together: persisted columns take more space. Plus links to the whole series.