Learn SQL articles

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> Subqueries, in SQL, are a powerful and essential tool, used within the main SQL queries to form sophisticated queries and to deal with complex data and database structures. They are inner queries nested in a main, or outer query which may […]

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> A trigger in Structured Query Language (SQL) is a special kind of stored procedure that automatically runs or fires when an event happens in the database. Triggers are mainly used to maintain the integrity of the data in the database. They

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> A view in Structured Query Language (SQL) is essentially a virtual table that is based on the result-set of an SQL statement. In other words, it is a saved query that you can treat as a standalone table. Views are particularly

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In the world of Structured Query Language (SQL), two concepts that tend to appear quite often are ‘normalization’ and ‘denormalization’. These are database design techniques that deal with how we store data in a relational database. Let’s delve into what each

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> Introduction In SQL, indexes are used to retrieve data from the database more quickly. They work similarly to an index in a book and are an essential part of any database structure. There are two main types of indexes: clustered and

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> As an SQL programmer, understanding the differences between the CHAR and VARCHAR data types is crucial to your data manipulation and storage strategies. Both these data types are used to store character data, but their behavior and characteristics vary significantly and

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In SQL language, a CASE expression is a conditional statement that allows you to add if-then logic to your SQL queries. CASE expressions provide a way to make decisions and generate different outputs based on those decisions. This increases the overall

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The SQL CASE statement is a conditional construct that allows for decision making in SQL queries. In other words, the CASE statement allows you to write if-then-else kind of logic in your SQL. Through this post, we’ll delve deeper into its

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The purpose of the CAST and CONVERT functions in SQL is to allow data of one type to be displayed or used as another type. This type of operation is also usually referred to as a “type casting” or “type conversion”.

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In the world of SQL programming, handling NULL values gracefully is crucial for building reliable, bug-free applications. Two key functions that the SQL language provides us to deal with NULLs are COALESCE and NULLIF. COALESCE function The COALESCE function is a