Confused by a bio, CV and resume? I explain what each one is, how they differ and when to use which, so you can put your best foot forward.
UNION vs UNION ALL: Reading the Operators Each One Adds to a Plan
Compare UNION vs UNION ALL through actual plans, duplicate-removal operators, memory grants and reads, then prove when branches cannot overlap.
Columnar, Graph and Spatial Databases: Three Shapes of Data
Columnar, Graph and Spatial Databases are three data models built for three kinds of questions: totals over many rows, paths through relationships, and distances between places. This post explains each one and builds all three in SQL Server 2025 with columnstore, graph tables and the geography type.
Key-Value and Document Databases: When Each One Fits
Key-Value and Document Databases are two NoSQL models. One finds a value by its key, the other stores a whole JSON document you can query by any field. This post shows when each one fits and builds both patterns in SQL Server 2025 with a key-value table and the json data type.
What Is Replication in SQL Server?
Replication in SQL Server copies chosen tables to other servers and keeps them current. Publisher, distributor and subscriber in plain words, the three kinds, and why replication is not high availability or a backup.
OLTP vs OLAP: Why Transactions and Analytics Need Different Designs
OLTP vs OLAP is the difference between recording what’s happening now and studying what’s already happened. This post compares the two designs, tests the same 500,000 orders as a rowstore and a columnstore table on SQL Server 2025, and shows how data moves from one side to the other.
Polymorphic Associations: Why One Column Cannot Point at Many Tables
One column that points at many tables cannot be enforced by SQL Server. Here is the demo, the orphans it allows, and a design that says no to bad rows.