Data platforms make decisions all day. An SQL query keeps the rows over a threshold, matches a keyword, and joins two tables on a shared ID. A pipeline sends a failed job down a retry path. Rules like ...
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SQL tricks with billionaires data
Intermediate SQL tutorial demonstrating REGEXP for advanced filtering, IF & CASE statements to create categories, SUBQUERIES for complex analysis, and JOINS for combining multiple tables — all shown ...
Introduction"I want to list customers who haven't ordered, but I get zero results," or "The count doesn't match when I exclude cancellations." Among SQL bugs, those caused by NULL are often discovered ...
The theme for this time is SQL "execution plans."Execution plans are one of the technologies you absolutely must understand when considering database performance.However, this content might also be a ...
A join filter allows a table to be filtered based on how a related table in the publication is filtered. Typically a parent table is filtered using a parameterized filter; then one or more join ...
Postgres engines now have access to more data than ever. With extensions like pg_lake, you can connect Postgres to gobs of files in object storage like csv, json, Apache Parquet™ and Apache Iceberg™.
Natural language interfaces have made it easier than ever to “talk to your data,” but turning a question into working SQL remains a surprisingly hard problem. SQL’s power lies in its structure and ...
Consistent SQL practice across varied platforms builds real job-ready confidence. Guided lessons help beginners, while timed challenges sharpen interview performance. Real datasets improve practical ...
Каждый, кто работает с SQL, рано или поздно усваивает "золотое правило": "Никогда не используй коррелированные подзапросы в SELECT!". Нам говорят ...
Why is the language developers and DBAs use to organize data such a mess? Here are 13 reasons we wish we could quit SQL, even though we probably won't. For all its popularity and success, SQL is a ...
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