3 min read ยท Feb 16, 2023 ROW_NUMBER() is a window function in SQL that assigns a unique sequential integer to each row in the result set returned by a query. It is commonly used to generate a unique identifier for each row, or to rank or sort rows based on a specified ordering. [amazon_auto_links…
3 min read ยท Feb 18, 2023 The NVL function in SQL is a tool for handling NULL values in database management. The NVL function takes two arguments, the first being the expression that is to be evaluated, and the second being the value that will be returned if the expression evaluates to NULL. The…
3 min read ยท Feb 20, 2023 NULLIF is a built-in function in SQL that compares two expressions and returns NULL if they are equal, and the first expression otherwise. It is typically used to prevent divide-by-zero errors in calculations or to return NULL instead of a default value. The syntax for NULLIF is as…
4 min read ยท Feb 21, 2023 The GROUP BY clause is an important component of the SQL (Structured Query Language) language. It is used to group rows of data based on one or more columns, and to aggregate data within each group to produce summary information. In this article, we will look at the basic concepts…
4 min read ยท Feb 25, 2023 The GROUP BY clause is an important component of the SQL (Structured Query Language) language. It is used to group rows of data based on one or more columns, and to aggregate data within each group to produce summary information. In this article, we will look at the basic concepts…
4 min read ยทFeb 25, 2023 Common Table Expressions (CTEs) are a powerful feature of SQL that can simplify complex queries and make them more readable. A Common Table Expression is a temporary named result set that is defined within the execution of a single SQL statement. It allows you to write queries that are…
5 min read – Feb 26, 2023 In SQL, Window Functions are a powerful tool for performing complex analytical queries on data. A window function is a function that performs a calculation across a set of rows that are related to the current row in a result set. The set of related rows is called…
4 min read ยท Feb 28, 2023 Structured Query Language (SQL) is a programming language used to manage and manipulate relational databases. One of the fundamental features of SQL is the ability to retrieve data from a database using SELECT statements. The WHERE clause is an essential part of a SELECT statement, allowing users to…
4 min read – Feb 28, 2023 In SQL, the HAVING clause is used to filter data based on aggregate functions. Unlike the WHERE clause, which filters rows before they are grouped and aggregated, the HAVING clause filters the results of the group-by operation. In other words, it allows you to apply conditions to groups…
4 min read ยท Mar 2, 2023 The SQL SELECT DISTINCT statement is a powerful tool for querying databases that allows you to retrieve unique values from a specific column or set of columns. This statement is used to filter out duplicate data and ensure that the output of a query is concise, organized and easy to interpret. In…