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PostgreSQL subqueries explained with simple examples

PostgreSQL subqueries allow one SQL query to run inside another, making it possible to solve filtering, aggregation, comparison, and table based problems without writing separate queries. The lesson ...
Redmond

Understanding Dirty Reads: What NOLOCK Does to Your Queries

Let's break down when it's ideal to use the NOLOCK hint and when you should never use it. As a consultant, I work on wide swaths of database systems, which means I get to see many, many SQL statements ...
Alex The Analyst on MSN

PostgreSQL case statements explained with simple examples

PostgreSQL CASE statements make it possible to add conditional logic directly into SQL queries, working similarly to IF ELSE statements in programming languages and spreadsheet tools. This tutorial us ...
Redmond

SQL Server 2019's Big Data Clusters Explained

The biggest feature in the SQL Server 2019 preview launched at Ignite is SQL Server Big Data clusters. Travis Wright, Microsoft's principal program manager for SQL Server, explains exactly what this ...
InfoWorld

SQL unleashed: 9 ways to speed up your SQL queries

A common SQL habit is to use SELECT * on a query, because it’s tedious to list all the columns you need. Plus, sometimes those columns may change over time, so why not just do things the easy way? But ...