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3

How Important is to Format your SQL Code?

Posted on May 25, 2021 by Carlos

A few days ago, I was quickly scanning my Twitter feed, and I saw a poll from a relatively popular Twitter account, asking people how they format their SQL code or how they apply a specific SQL code format. After… Continue Reading →

Best Practices, SQL, SQL Developer
2

The SQL Group By Clause

Posted on March 12, 2019 by Carlos

This is the written version of a lesson from my SQL Course, in which I introduce students to the awesome and very commonly used SQL GROUP BY clause. If you want to follow along, here is the script you can… Continue Reading →

Basics, Functions, SQL aggregate, aggregate functions, aggregates, GROUP BY, GROUP BY clause, SQL
1

The FIRST and LAST functions in Oracle SQL

Posted on September 27, 2018 by Carlos

This is the written version of a lesson from The Ultimate Oracle SQL Course, in which I show how to use the Oracle FIRST and LAST functions. Like some other functions you probably know, these functions can be used either… Continue Reading →

Functions, SQL aggregate, analytic, FIRST, function, functions, LAST, Oracle, SQL
3

Pairwise Comparisons With Subqueries in Oracle SQL

Posted on September 11, 2018 by Carlos

I recently received a question about Pairwise Subqueries from one of the students in my SQL course, and I thought it would be a good idea to make my answer a blog post, since I did a couple of Google… Continue Reading →

SQL Oracle, SQL, Subquery
39

Count(*) Vs Count(1) Again?

Posted on January 31, 2017 by Carlos

I decided to write this article because the question about COUNT(*) Vs COUNT(1) keeps being asked, and I usually find myself explaining my answer again and again and/or looking for links to someone else’s articles that can help support my… Continue Reading →

SQL, Tuning 10053, count, count(*) vs count(1), COUNT(1), count(1) vs count(*) oracle, optimizer, query, Trace, Transformation

OTN Appreciation Day : The Power of Oracle SQL

Posted on October 11, 2016 by Carlos

I’m writing this post as a contribution to the OTN appreciation day because I think Tim Hall’s idea was awesome. If I have to choose the feature I like and enjoy the most, it has to be the power of… Continue Reading →

Functions, SQL features, OTN
4

Prioritizing Rows: The Ranking Functions

Posted on August 25, 2016 by Carlos

Ranking functions are some of the most commonly used analytic functions, and although the “ranking” category can quickly make you think about Top-N queries, that is actually not the only type of problems you can solve with them. In this… Continue Reading →

Functions, SQL analytic, function, functions, Oracle, prioritize, ranking, SQL, top-n
11

The awesome Pivot and Unpivot Features in Oracle SQL

Posted on June 10, 2016 by Carlos

I decided to write about the Pivot and Unpivot clauses, because I find them very useful and powerful. In this article I will try to explain how they are used and show you some examples of the things you can… Continue Reading →

SQL columns, convert, Oracle, pivot, rotate, rows, SQL, transpose, unpivot
11

Understanding Analytic Functions

Posted on April 17, 2016 by Carlos
analytic functions windowing clause

Analytic functions in Oracle SQL are very useful and are utilized by many people, but sometimes without completely understanding how they work or what data they operate on. This article does not focus on a specific function, but on analytic… Continue Reading →

Functions, SQL analytic, function, functions, Oracle, partition, SQL, window, windowing
29

Understanding a Query’s Execution Plan

Posted on January 30, 2016 by Carlos

One of the most basic tasks you need to perform when tuning SQL statements is determining the causes of the performance problem, and to do that, you will most likely need to analyze the execution plan of the problematic statement.… Continue Reading →

SQL, SQL Developer, Tuning access path, autotrace, cost, execution plan, explain plan, Join, optimizer, SQL Developer, tuning

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  • The SQL Group By Clause
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