How to Calculate the Average of Multiple Rows in SQL

How to Calculate the Average of Multiple Rows in SQL

Calculating the average of multiple rows in SQL is a fundamental operation that can provide valuable insights into a dataset. Whether you’re working with financial data, survey results, or any other type of information, understanding how to calculate averages is essential.  We can calculate averages of multiple rows in SQL, we can group data for…

How to Get Current Year and Previous Year in Oracle SQL? – A Comprehensive Guide

How to Get Current Year and Previous Year in Oracle SQL? – A Comprehensive Guide

Understanding time is critical for effective data analysis in Oracle SQL. Extracting specific timestamps, like the current year or previous one, allows you to spot trends, compare performance, and gain valuable insights from your data.  This comprehensive guide will explore multiple methods for retrieving the current and prior years in Oracle SQL. Retrieving the Current…

Postgresql Vs Sql Server | Similarities and Dissimilarities
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Postgresql Vs Sql Server | Similarities and Dissimilarities

PostgreSQL and SQL Server are popular relational database systems. PostgreSQL, open-source and highly extensible, emphasizes standards compliance. SQL Server, a Microsoft product, integrates well with Microsoft tools and offers proprietary features. Each has distinct strengths, with PostgreSQL favored for its openness and flexibility, while SQL Server is known for seamless integration within the Microsoft ecosystem….

How to Run SQL Tuning Advisor in Oracle 19C Manually | 6 Steps Procedure

How to Run SQL Tuning Advisor in Oracle 19C Manually | 6 Steps Procedure

To run SQL Tuning Advisor manually in Oracle Database 19c, you can use the SQL*Plus command-line tool or Oracle SQL Developer.  You need to identify slow SQL, create a tuning task in Oracle 19c using DBMS_SQLTUNE, execute it, and follow recommendations for better performance. Manual tuning is essential for complex queries and allows control over…

Convert Date From String to Date in SQL | A Comprehensive Guide

Convert Date From String to Date in SQL | A Comprehensive Guide

When dealing with date information arriving in string format, the date conversion data types become essential. In SQL, date conversion from string to date  can be done using functions like CAST or CONVERT (e.g., SELECT CAST(‘2023-12-27’ AS DATE) AS ConvertedDate;). Some databases offer alternatives like PARSE or TO_DATE for converting string dates with specific formats,…

SQL Compare Date Without Time | A Practical Guide

SQL Compare Date Without Time | A Practical Guide

Comparing dates without times is a common need when working with SQL databases. Luckily there are several methods and built-in functions to compare dates in SQL without factoring in the time portion But sometimes you just want to focus on the date component for your queries and analysis.  This guide will talk about various techniques…

SQL Check if String Contains Letters | A Comprehensive Guide

SQL Check if String Contains Letters | A Comprehensive Guide

Strings in SQL database can be a mix of Numbers, symbols, and maybe even hidden letters. CHARINDEX(), PATINDEX(), and LIKE operators are used to uncover alphabetic characters within strings. This article will provide a comprehensive guide on different methods to check if a string contains letters in SQL Server.  Why and How to Check for…

How To Round Down A Number With The Floor Function In SQL Server

How To Round Down A Number With The Floor Function In SQL Server

When working with numbers in SQL Server, there are times when you need values to be rounded down to the nearest whole number. The FLOOR function comes in handy for this task.  It’s a tool within SQL Server that takes any number you give it and chops off the decimal part, always returning the largest…