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In this video: In this video, we will learn View with simple explanation and practical examples. Welcome to ANFA CODE On ...

BIN HE TALKS — Technology, Ideas & The Future Episode 102: Joins, Subqueries, and CTEs: Writing SQL People Can Read ...

Want the rows with no match? LEFT JOIN and filter WHERE id IS NULL, or use WHERE NOT EXISTS for the same result.

Without an index, PostgreSQL starts two parallel workers and scans the whole table to fetch one row. After CREATE INDEX ...

Welcome to Python to Job — your fast-track roadmap from complete beginner to job-ready Python developer! ✓ 100% ...

BIN HE TALKS — Technology, Ideas & The Future Episode 101: Window Functions: The SQL Superpower Interviewers Love ...

Casting a bad string to UUID throws an error, but every database handles it differently. MySQL has IS_UUID, SQL Server has ...

SQL DISTINCT still returning duplicates explained — why DISTINCT dedupes whole rows, not the first column, and how to get one ...

Not in a magic cloud. Every PostgreSQL table ends up as files in the PGDATA directory, and one query to pg_settings tells you ...

index can make one query faster while making every INSERT, UPDATE, and DELETE more expensive. In Part 5 of our SQL ...

Need the latest product for every region? LATERAL JOIN runs a subquery once per row, like a for-each loop, which a plain LEFT ...

A transfer moves money out of one account and into another, and a transaction wraps both steps together. If anything fails ...

OLTP databases load whole rows into the buffer pool, so inserts, updates and deletes are fast. OLAP column storage loads only ...

A cross join builds a Cartesian product, but when a product is made in every region it is exactly what you need. Use it with extreme ...

Transaction two counts three rows, transaction one inserts and commits a fourth, and the same SELECT now returns four. That is a ...

Inside one open transaction you read a balance of 500, another transaction commits 100, and the same SELECT now returns 100.

INNER is optional in SQL, but spelling it out keeps your joins clear and readable, and scratch code always ends up in production.

Transaction two reads 100 while transaction one is still open, then transaction one rolls back to 500. That is a dirty read: acting on ...

Snowflake Zero to Hero #16 | Git Workspaces in Snowflake — Complete Step-by-Step Hands-On Tutorial!** Welcome back to ...

Want to become a Data Scientist in 2026 but don't know where to start? In this video, you'll learn a complete Data Scientist ...