Data Mining Part 20: Excel and Data Mining,accuracy, forecasting
In the lesson 18 and 19 we worked with Data Mining Models.
In this new chapter we will work with more algorithms and show how to test the accuracy of the model.
Data Mining Part 20: Excel and Data Mining,accuracy, forecasting
In the lesson 18 and 19 we worked with Data Mining Models.
In this new chapter we will work with more algorithms and show how to test the accuracy of the model.
SQL Server Source Control Basics
Source control can and should play a key role in the database development and deployment process, and this book will show you exactly how to get started.
Troubleshooting SQL Server: A Guide for the Accidental DBA
Three SQL Server MVPs, and stalwarts of the SQLServerCentral and MSDN community forums, provide fascinating insight into the most common SQL Server problems, why they occur, and how they can be diagnosed using tools such as Performance Monitor, Dynamic Management Views and server-side tracing. The focus is on practical solutions for removing root causes of these problems, rather than "papering over the cracks".
Set up a Memory Quota for SQL Server Memory Optimized Databases
You successfully entered into the In-Memory OLTP world by the hand of SQL Server 2014. After a while you notice that the In-Memory objects are using more memory than you estimated. In this tip you will learn how to proceed.
SQL Server Luxembourg: Wait Watchers
On November 19, 2014, the SQL Server Luxembourg User Group and Dell Software will be hosting a free event. Richard Douglas will be be presenting a double bill: SQL Server 2014 features everyone can use, and Wait watchers - Gain Performance Increases Fast! This event is free to registered attendees.
Pay It Forward
Steve Jones looks at the dilemma of training developers and having them leave, or maybe, just having them stay untrained.
Using Comments to Quickly Test CTEs
A quick tip for using a combination of block and line comments to test CTEs
Acceptance Testing with FitNesse: Database Fixtures, Project Overview
There aren't many frameworks for writing acceptance tests for databases, including SQL Server. FitNesse is an obvious choice since it is designed with a Wiki-style interface that, once it is configured and set up correctly, makes it very easy for a non-specialist to set up individual tests.
ETL Performance Auditing - Part 2: Auditing Data Staging Phase
Easy way to setup a comprehensive ETL Performance auditing Solution no matter how complicated your ETL setup.
Blogs
AI Helps Me with My Sloppiness
By Steve Jones
I type fairly well. Well, I type fast, but I do wear out a...
Automatic Index Compaction
By ReviewMyDB
Index maintenance has always meant nightly jobs and a window you have to defend....
The Goldilocks problem – Materialized Views
I’m sure you’ve all heard the tale of Goldilocks and the Three Bears, but...
Forums
SQL Art, Part 4: Happy 4th of July — A British DBA's Guide to Celebrating a War We Don't Talk About
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
How We Handled a Vendor Retry That Loaded Twice in Snowflake
Comments posted to this topic are about the item How We Handled a Vendor...
Cognitive Coverage
Comments posted to this topic are about the item Cognitive Coverage
Question of the Day
Getting the Average
I have this data in the dbo.Commission table in a SQL Server 2022 database.
salesperson commission Brian 12 Brian 16 Andy 7 Andy 14 Andy 21 Steve 20 Steve NULLAll the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
, AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
FROM commission
GROUP BY SalesPerson
GO
What average commission is calculated for Steve? See possible answers