Data Mining Part 19: Excel and Data Mining, Samples, Queries
This lesson explains how to Clean Data, Explore Data, get Samples of Data, Classify and query a Data Mining Model.
Triple Digits
Salaries for data professionals have risen quite a bit, according to the latest salary survey. That's good for those of us working with SQL Server.
Data Is Crazier than You Think
As a society, we have an unrealistic respect for data, especially if it has a decimal point somewhere and uses metric units. We who are in the business of data need to cultivate a renewed interest in the sceptical and rigorous science of statistics: it is too important to leave to 'Data Scientists'. If the data is wrong, or the way we analyse or report it is misleading, much of what we do is pointless.
SQL Monitor Custom Metric: Average I/O Stalls
This metric is a great general indicator of performance problems. High stall times indicate I/O problems, which can be attributed to busy physical disks or queries that return large data sets to the client.
Dynamically change background color in SSRS reports using custom code
This article demonstrates the use of custom code and cell expressions referencing that custom code to toggle the background color of groups of rows in an SSRS report based upon value-changes in one of the fields.
Managers: who needs them?
Managers, look away now. Patrick Index wants to get something off his chest...
Preparing Your Enterprise for Big Data
Big data applications are now fairly commonplace in large organizations. It is, however, difficult to simply ‘drop’ these applications into an existing IT infrastructure and expect to run smoothly. In addition to energy and cooling requirements for new hardware to support the new big data application, other IT areas need to prepare.
Memory Corruptions, or Why You Need DBCC CHECKDB
DBCC is a mechanism that can protect you against corruptions causing substantial data loss in your database. If you use it.
The MidnightDBAs release Minion Reindex
The MidnightDBAs have developed a free reindexing solution to help DBAs perform maintenance on their instances. Read about the solution and attend their webinar.
The Role of the Technical Architect in Development
What do Technical Architects (TAs) actually do when in a development role? Are they just senior developers 'pushed upstairs' into a management role? Is there a clear distinction between a TA and a product, or project, manager? In an increasingly automated and joined up development environment, the role is important, varied and wide-ranging; as Grzegorz Strzelecki explains.
Blogs
How AgentDBA Identifies Backup Failures
By Arun Sirpal
Every DBA has a box like this. Sitting untouched for months. Nobody’s proud of...
AI Helps Me with My Sloppiness
By Steve Jones
I type fairly well. Well, I type fast, but I do wear out a...
WITH clause gets a 26ai boost!
By way of background, a while back I did video called “My New Favourite...
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