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 >> The COALESCE function in SQL plays an indispensable role when it comes to data manipulation and analysis. Its primary purpose is to return the first non-null expression among its arguments. When performing data analysis, it’s common to encounter null values in

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> SQL, or Structured Query Language, is a standardized programming language that is used for managing and manipulating relational databases. Among its many functions, the CONCAT function stands out as a particularly useful tool. But what exactly does the CONCAT function do

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The CONCAT_WS function in SQL is designed to consolidate several expressions or strings into a single value, with each one separated by a specified separator. CONCAT_WS is an abbreviation for ‘Concatenate With Separator’. This function is highly useful in SQL and

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> SQL (Structured Query Language) is a highly versatile language used in the world of databases for manipulating and retrieving data. Among the various operations that SQL provides, JOIN operations are some of the essential features, helping us retrieve data from two