Fix link in 2024-05-20-learn-postgresql-and-sql-quickly-and-free.md b…

…log post (#905)

content/blog/2024/2024-05-20-learn-postgresql-and-sql-quickly-and-free.md

@@ -17,7 +17,7 @@ First, let me state that I have no connection to the website or its author. I di
 
 ## Learn SQL. Learn PostgreSQL.
 
-[PGexercises.com](PGexercises.com) is based on increasingly complex exercises based on a provided dataset. As you progress, the questions get trickier. You do not have to download and load the available data into a server to do the exercises.  
+[PGexercises.com](https://pgexercises.com/) is based on increasingly complex exercises based on a provided dataset. As you progress, the questions get trickier. You do not have to download and load the available data into a server to do the exercises.  
 
 There are seven groups of exercises - Basic, Joins and Subqueries, Modifying Data, Aggregates, Date, String, and Recursive. The author recommends Learning SQL by Alan Beaulieu as a reference text. Any essential book, Structured Query Language, will serve you well.
 
@@ -49,4 +49,4 @@ Not only do you see the answer to the question, but there is a detailed analysis
 
 I am so impressed wth these exercises that the Percona Community Team is in discussion of creating a series of videos on them. Not only that, on of my colleagues who is learning PostgreSQL is volunteering to work through the exercises so that the series will feel like a study group. And I will comment on the query, possible alternatives when they exist, and help you work through the 'rough spots'.
 
-If you want to work along, please do. Let us know where you struggle or the places we are redundant. Out goal is to provide a first class learning experience to help people learn SQL and PostgreSQL.
+If you want to work along, please do. Let us know where you struggle or the places we are redundant. Out goal is to provide a first class learning experience to help people learn SQL and PostgreSQL.