Gregory Larsen

Currently a SQL Server DBA. I've been working with SQL Server since 1999. I'm an old-time mainframe DBA. My DBA career started in 1985. Currently studying to obtaining MCDBA.

Stairway to T-SQL DML

Stairway to T-SQL DML Level 5: The Mathematics of SQL: Part 2

Joining tables is a crucial concept to understanding data relationships in a relational database. When you are working with your SQL Server data, you will often need to join tables to produce the results your application requires. Having a good understanding of set theory, and the mathematical operators available and how they are used to join tables will make it easier for you to retrieve the data you need from SQL Server.

5 (1)

You rated this post out of 5. Change rating

2019-05-29 (first published: )

17,885 reads

Stairway to T-SQL DML

Stairway to T-SQL DML Level 4: The Mathematics of SQL: Part 1

A relational database contains tables that relate to each other by key values. When querying data from these related tables you may choose to select data from a single table or many tables. If you select data from many tables, you normally join those tables together using specified join criteria. The concepts of selecting data from tables and joining tables together is all about managing and manipulating sets of data. In Level 4 of this Stairway we will explore the concepts of set theory and mathematical operators to join, merge, and return data from multiple SQL Server tables.

5 (6)

You rated this post out of 5. Change rating

2019-05-22 (first published: )

24,126 reads

Stairway to T-SQL Beyond The Basics

Stairway to T-SQL: Beyond The Basics Level 3: Building a Correlated Subquery

This stairway level will expand on the subquery topic by discussing a type of subquery known as a correlated subquery, and explores what a correlated subquery is and how it is different from a normal subquery.

3.67 (3)

You rated this post out of 5. Change rating

2019-05-08 (first published: )

20,240 reads

Blogs

How important is having great soft skills as a Software Engineer for personal growth and career…

By

How important is having great soft skills as a Software Engineer for personal growth...

Master Advanced SQL: 2 Essential Courses for Every Data Analyst

By

If you're a data analyst, you already know that SQL isn't just a nice-to-have...

Friday Flyway Tips–State-based Deployments

By

Recently the Flyway Desktop (FWD) team release support for state-based deployments. These are similar...

Read the latest Blogs

Forums

The Costs and Rewards of Speaking

By Steve Jones - SSC Editor

Comments posted to this topic are about the item The Costs and Rewards of...

Manage Elastic jobs in Azure using Azure Elastic Jobs Manager

By Kunal Rathi

Comments posted to this topic are about the item Manage Elastic jobs in Azure...

Takeaways from Data Grillen 2024

By Tonie Huizer

Comments posted to this topic are about the item Takeaways from Data Grillen 2024

Visit the forum

Question of the Day

Inserting Transaction Marks

When is a transaction mark first inserted into the msdb.dbo.logmarkhistory table?

See possible answers