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.

Free eBook: SQL Server Backup and Restore

In this free eBook Shawn McGehee offers advice on query tuning, cutting stored procedures, and system process design and implementation for high availability. Discover how to perform backup and restore operations using SQL Server Management Studio (SSMS), basic T-SQL scripts and Redgate's SQL Backup tool.

Blogs

The SQL Change Automation in SSMS Beta

By

Give it a try, as the beta is out. I’ve been watching this product...

Containers: Working With Volumes

By

In the previous two posts on containers I showed how use Docker commands to...

Speaking at PASS Summit 2019

By

I am delighted to announce that I have been selected to speak at the...

Read the latest Blogs

Forums

The Change Failure Rate

By Steve Jones - SSC Editor

Comments posted to this topic are about the item The Change Failure Rate

Sql server 2016 storing foreign language data

By wendy elizabeth

In a sql server 2016 database, I want to store data in one column...

What is going on with my rebuilding index job?

By WebTechie

We migrated a major server to a new cluster.  Installed SQL Server 2017 and...

Visit the forum

Ask SSC

SQL Server Q&A from the SQLServerCentral community

Get answers