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MySQL SELECT statement: Columns, DISTINCT, and calculations beginner tutorial

The MySQL SELECT statement controls which columns and values appear in query results, making it one of the most important ...
I Programmer

SQL Workshop - Selecting columns without a non-aggregate column

That’s happening because column m.unit is used in the SELECT clause but not in the GROUP BY clause. This is a perfectly valid and reasonable response from our DBMS, but in this exceptional case, ...
TechRepublic

SQL basics: SELECT statement options

Learn how to master the SELECT statement to form truly useful data queries. This article explains functions, clauses, and keywords that will make your life a lot easier. Due to popular demand, we’re ...

[Database Series 07] Understand Indexes! Why the Same SQL Can Have Vastly Different Search Speeds

The theme for this session is database "indexes".Indexes are one of the technologies you absolutely must understand when ...
Simon Fraser University

Counting and Grouping Data Automatically

You can count and report the total number of rows that have the same value for one or more columns. You can use the automatic group by feature to group the values according to their columns. The ...
I Programmer

SQL Workshop - Selecting columns without a non-aggregate column

Thinking in terms of sets and set operations can be difficult at first but after a while you discover that you can do things without needed to drop down to procedural approaches. This scenario ...