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Day 8 - Relational Database 101 - PostgreSQL Internals
4+ hour ago (1576+ words) একবার একটু technological দিকে আসি, আপনি যখন Facebook বা LinkedIn-এ কাউকে message করেন তখন সেটা সরাসরি তার কাছে send হয়। Reason হচ্ছে আপনারা connected। এখানে আপনি directly message ত…...
Why Parameterized Queries Matter for SQL Security
4+ hour, 21+ min ago (559+ words) SQL injection is one of the classic examples of what can happen when an application mixes user input directly into a database query. The underlying problem is simple. The application expects data. The database may interpret part of that data…...
Database Isolation Levels: What Can Concurrent Transactions Actually See?
44+ min ago (743+ words) Transactions do not execute in isolation from reality. Isolation levels define how much of that reality they are allowed to observe. In the previous topic, we explored Optimistic and Pessimistic Concurrency Control. Now we can go one level deeper. What…...
Recursive CTEs: How SQL Secretly Learned to Loop
5+ hour, 16+ min ago (454+ words) Ask a SQL query to find "all employees under this manager," and things get ugly fast if you don't know how many levels deep the org chart goes. A regular join handles one level. Two joins handle two levels. Nobody's…...
The SQL Queries That Lie to You With a Straight Face
1+ hour, 16+ min ago (191+ words) Seven queries that run without error, return a result, and are still wrong — and how to stop writing them. Some SQL mistakes throw an error …...
EXPLAIN Describes a Query. Production Is Everything Else That’s Running.
3+ hour, 10+ min ago (1398+ words) A while back I wrote about migrating a terabyte of banking data from Oracle to PostgreSQL with no downtime. The part people …...
I Replaced Chroma, Qdrant, and Pinecone With a SQLite File
3+ hour, 6+ min ago (165+ words) I needed a vector DB that didn’t require a daemon. SQLite was already there. Every RAG tutorial starts the same way. Step one: install …...
Every text-to-SQL benchmark score you've seen was measured without access control
7+ hour, 45+ min ago (955+ words) Spider, BIRD, LiveSQLBench. If you have evaluated a text-to-SQL system in the last five years you have quoted a number from one of them. All three ask the same question: given a schema and an English question, does the system…...
IEnumerable vs. IQueryable in C#
9+ hour, 49+ min ago (429+ words) This distinction sounds simple stated this way, but it has real, concrete consequences for where computation happens, how much data crosses the network, what C# expressions are even legal to write, and a specific, common class of bug that this…...
Pattern #007: Moving / Rolling Windows in SQL
9+ hour, 43+ min ago (33+ words) How to calculate what happened over the last N days — without confusing it with a running total A product manager asks: “What was our average daily …...