SQL
Our SQL articles below clearly and simply how to use specific aspects of SQL that we also cover in our SQL training courses.
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SQL Joins Explained In <5 Minutes [4 Step-by-Step Examples]
SQL Joins make new tables by retrieving data from other tables. The relationship between tables is expressed (or described) as a type of SQL join. This article gives you a clear, step-by-step introduction to the four different SQL join…
SQL Rank Functions – Quick Breakdown
Among the myriad functions SQL offers, specific functions such as RANK and DENSE_RANK stand out for their utility in data analysis and reporting tasks. These functions empower users to make sense of data by enabling them to order and rank…
Study These 15 SQL Interview Questions!
SQL interviews focus on topics like database design, query optimization, joins, and indexing. Mastering these areas helps candidates demonstrate their ability to manage and manipulate data efficiently. Practising SQL fundamentals and advanced concepts ensures readiness for technical assessments and…
[Detailed Guide] SQL Update Statement
This article explains how to use the SQL UPDATE statement for updating table rows in SQL SERVER. It looks at what the SQL UPDATE statement is, how you can use it, and some rules and best practices for using it.…
Mastering The SQL IF Statement
In this article, you will see how to use the SQL IF statement for the conditional execution of your SQL script. You will see what SQL IF statements are, how to use them in simple and complex situations, and what…
Master Union Queries & Select Statements – [SQL and Access]
Normally when bringing two sets of data together in a relational database the intention is for data in the two sources to be matched in some way. For example: Customers to Invoices, Suppliers to Parts, Staff to Absence. Occasionally, but…
How To Backup Your SQL Databases Today!
Backup and Restore are critical concepts to understand when working with databases in SQL and SQL Server. Whether you are new to SQL and/or SQL Server or an experienced database analyst, you never know when a disaster might occur. It…
Temporary Tables In MS SQL
There are four types of tables in MS SQL: Permanent: Normal tables you create and save #Local Temporary: Short term tables, only used in that procedure for that user ##Global Temporary: Short term tables available to all…