2023-11-27
4,923 reads
Articles
Time Series Data Mining Example with T-SQL when Adding New Data
Learn about working with time series data using T-SQL code and how to add additional data to the data set for more in-depth data mining.
2023-11-27
Comparing Two Execution Plans
This is a short look at a technique that I discovered recently in Management Studio (SSMS). The technique is to compare two graphical execution plans in the tool to understand what they are doing and how two different queries might affect a particular system, both with the image and with the properties' data behind the […]
2023-11-24 (first published: 2021-03-30)
8,815 reads
Black Friday returns to SQLServerFast
November approaches again. For Europeans, that is a month like any other, for Americans, November means: Black Friday, with huge discounts!
2023-11-24
Unpivoting Multiple Sets of Columns in SQL Server using CROSS APPLY
Learn how to unpivot data or sets of data with SQL Server queries using CROSS APPLY.
2023-11-24
Advanced SQL Server installation using Powershell DSC
Introduction In the previous article, we learned how to install a SQL Server instance with basic parameters like InstanceName, Features, SourcePath, SQLSysAdminAccounts, etc using Powershell DSC. In this article, we'll discover how to enhance our SQL Server installation with additional configurations. We'll cover things like setting up service account credentials, custom installation directories, configuring TempDB […]
2023-11-22
3,741 reads
Azure DocumentDB: Working with Microsoft's NoSQL Database in the Cloud
Coding for the new NoSQL JSON database service that supports SQL queries.
2023-11-22
T-SQL Fundamentals: Controlling Duplicates
When people start learning a new field, for example T-SQL, it’s tempting to spend very little time trying to understand the fundamentals of the field so that you can quickly get to the advanced parts.
2023-11-22
2023-11-20 (first published: 2023-10-02)
2,703 reads
SQL Window Functions Series: RANK() and DENSE_RANK()
Welcome to the fascinating world of SQL window functions! Today, we'll explore in detail: RANK() and DENSE_RANK().
2023-11-20 (first published: 2023-11-15)
7,751 reads
Blogs
Free webinar – Tackling the Gaps and Islands Problem with T-SQL Window Functions
I’m hosting a free webinar at MSSQLTips.com at the 19th of December 2024, 6PM...
Counting Groups with Window Functions: #SQLNewBlogger
By Steve Jones
I looked at row_number() in a previous post. Now I want to build on...
The query processor ran out of internal resources and could not produce a query plan – When You’ve Managed to Confuse SQL With a Crazy IN Clause.
Recently I received a cry for help over Teams. The issue was that an...
Forums
Find rows with very close time stamps
Given the following table and query, this will return any records(based on message_id) that...
How to merge two tables with unlike fields
How to merge two tables with unlike fields. I have two table with one...
Visual Studio 22 / SSIS Project / (Project) Connection problem
Hello, First of all, I find it odd/annoying that I can't exclude a Project...
Question of the Day
The LAGging NULL
I have this data in a SQL Server 2022 table:
player yearid team HR Alex Rodriguez 2012 NYY 18 Alex Rodriguez 2013 NYY 7 Alex Rodriguez 2014 NYY NULL Alex Rodriguez 2015 NYY 12 Alex Rodriguez 2016 NYY 9If I run this code, what are the results returned in the hrgrowth column?
SELECT player , yearid , hr , hr - LAG (hr, 1, 0) IGNORE NULLS OVER (ORDER BY yearid) AS hrgrowth FROM dbo.playerstats;See possible answers