MySQL audit logging using triggers
Introduction In this article, we are going to see how we can implement an audit logging mechanism using MySQL database triggers to store the old and new row states in JSON column types.
SQL JOIN USING – A Beginner’s Guide
Introduction In this article, we are going to see how the JOIN USING clause works in SQL, and how we can use it to replace the ON condition clause when the columns used to join the two tables have the same name in both the parent and the child tables.
SQL LEFT JOIN – A Beginner’s Guide
Introduction In this article, we are going to see how LEFT JOIN works in SQL, and how we can use it to associate rows belonging to different tables and build compound result sets. Unlike JOIN or INNER JOIN, LEFT JOIN is an OUTER JOIN. So, LEFT JOIN and LEFT OUTER JOIN are equivalent. Other OUTER JOIN types are RIGHT OUTER JOIN and FULL OUTER JOIN. However, since the SQL OUTER keyword is superfluous, it’s usually omitted.
SQL INNER JOIN – A Beginner’s Guide
Introduction In this article, we are going to see how INNER JOIN works in SQL, and how we can use it to associate rows belonging to different tables and build compound result sets.
SQL CROSS JOIN – A Beginner’s Guide
Introduction In this article, we are going to see how a CROSS JOIN works, and we will also make use of this SQL join type to build a poker card game.
How to get the query execution plan on SQL Server
Introduction In this article, we are going to see how we can get the query execution plan when using the SQL Server relational database system. The execution plan allows you to understand the operations done by the database engine when executing a specific SQL query.
How to get the SQL execution plan on Oracle
Introduction In this article, we are going to see how we can get the SQL execution plan on Oracle. When tuning performance, the execution plan is indispensable as it allows you to understand the operations done by the database when executing a certain SQL query.
How to limit the SQL query result set to Top-N rows only
Introduction In this article, we are going to see how we can limit the SQL query result set to the Top-N rows only. Limiting the SQL result set is very important when the underlying query could end up fetching a very large number of records, which can have a significant impact on application performance.
Pagination best practices
Introduction In this article, we are going to discuss several data pagination best and worst practices. Data pagination is omnipresent in enterprise applications. Yet, most solutions, not only they offer a bad user experience, but they are also inefficient.
SQL ORDER BY RANDOM
Introduction In this article, we are going to see how we can sort an SQL query result set using an ORDER BY clause that takes a RANDOM function provided by a database-specific function. This is a very handy trick, especially when you want to shuffle a given result set. Note that sorting a large result set using a RANDOM function might turn out to be very slow, so make sure you do that on small result sets. If you have to shuffle a large result set and limit it afterward, then it’s… Read More
