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.

Blogs

Monday Monitor Tips: Intelligent Alert Thresholds

By

At the recent Redgate Summit in Chicago, I demo’d (lightly) the ML based Alert...

A New Word: los vidados

By

los vidados – n. the half-remembered acquaintances you knew years ago, who you might...

In-Person CISA Training – April 13-16, 2026

By

I will be leading an in-person Certified Information Systems Auditor (CISA) exam prep class...

Read the latest Blogs

Forums

Fare Labs Pvt. Ltd. is a food testing laboratory.

By farelabs

FARE Labs provides nutritional testing for food items and agricultural goods in order to...

String_agg not working as needed

By DaveBriCam

I'm trying to get this string_agg to put all the 'comments' into one result...

Vectors in SQL Server 2025

By Daniel Calbimonte

Comments posted to this topic are about the item Vectors in SQL Server 2025

Visit the forum

Question of the Day

Odd Sequences

What values are returned from this code?

CREATE SEQUENCE NumericSequence
    AS NUMERIC(5,1)
    START WITH 1.0
    INCREMENT BY 0.1;
GO
SELECT NEXT VALUE FOR NumericSequence
GO
SELECT NEXT VALUE FOR NumericSequence
GO

See possible answers