Learn SQL articles

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> If you’ve been working with SQL, you must have come across the terms ‘FETCH NEXT’ and ‘OFFSET FETCH’. These are powerful commands that are widely used to limit the number of rows returned from a query and controlling the starting point […]

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The FORMAT function is a built-in string function in SQL. It helps to format a specified value into a specific format. What does it mean? In simpler terms, it’s like getting a certain output in the form and structure we desire.

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> SQL or Structured Query Language is a universal language for managing and processing data stored in Relational Database Management System (RDBMS) or for stream processing in a Relational Data Stream Management System (RDSMS). Among the many clauses in SQL, a conceptually

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> When working with SQL, it’s important to use the correct clauses to filter and manipulate our data as required. Among the numerous clauses in SQL, the HAVING clause plays a critical role especially when you’re working with aggregate functions or when

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In Structured Query Language (SQL), the IN operator is a logical operator that allows you to specify multiple values in a WHERE clause. Essentially, IN operator is used to reduce the need for multiple OR conditions in a SELECT, DELETE, INSERT,

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The ISNULL function is a very handy tool in SQL Server. It allows you to replace NULL values with a specified value. The importance of this function lies in the fact that in SQL, NULL is not a value, but a

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In SQL, LAG and LEAD are functions that provide a simple way to access data from a previous or following row without using a self-join. These are particularly important in business situations where comparisons between consecutive rows are constantly required, such

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In the world of SQL (Structured Query Language), operators play a very crucial role in retrieving data based on specific patterns and rules. One such operator is the LIKE operator. The LIKE operator is used in a WHERE clause to search

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> In the wide world of SQL (Structured Query Language), the ROW_NUMBER() function serves a vital and versatile role. As a built-in function in most Relational Database Management Systems (RDBMS), ROW_NUMBER() provides an efficient way to number rows in the result-set of

For an instructor lead, in-depth look at learning SQL click below. Learn SQL >> The STRING_AGG is a built-in function in SQL Server (starting with 2017) that concatenates the values of string expressions and places a separator between them. This function simplifies the concatenation of strings. Prior to SQL Server 2017, you had to use