2020-11-10
667 reads
statistics
Mean Median Mode using SQL and DAX
This article explains how to calculate the important statistical functions, MEAN, MEDIAN, and MODE, in both T-SQL and DAX.
2020-02-28
34,036 reads
Basic Concepts of Probability Explained with Examples in SQL Server and R
Many organizations have known the fact that data have been evolved from the by-product of corporate applications into a strategic asset [1]. Like other corporate assets, the asset requires specialized skills to maintain and analyze. With modern data analytic tools, for example Python, R, SAS and SPSS, IT professionals can build models and uncover previous unknown knowledge from the ocean of data.
2020-01-27
1 reads
How to Think Like the SQL Server Engine: Using Statistics to Build Query Plans
Every index has a matching statistic with the same name, and each statistic is a single 8KB page of metadata that describes the contents of your indexes. Stats have been around (and been mostly the same) for forever, so this is one of the places where SQL Server’s documentation really shines: Books Online has a ton of information about statistics. You honestly don’t need to know most of that – but if you wanna make a living performance tuning, there’s a ton of great stuff in there.
2019-11-21
Customizing Statistics Histogram in SQL Server 2019
The use of statistics in SQL Server is tightly embedded in the query optimizer and query processor. The creation and maintenance of statistics is usually handled by the SQL Server engine, though many DBAs and developers know that periodically we might need to update those statistics to ensure good performance of queries. SQL Server 2019 gives us more options.
2024-01-09 (first published: 2019-04-01)
3 reads
2018-12-31
738 reads
Finding & Fixing Statistics Without Histograms
Men Without Hats were awesome. Statistics without histograms are terrible, but now they're easy to find and fix.
2018-10-12
3,200 reads
2018-06-11 (first published: 2018-01-03)
2,648 reads
Introduction to Statistics
This article will give a brief overview of how statistics are generated, stored, and used in SQL Server.
2019-06-28 (first published: 2017-10-17)
9,170 reads
Statistics in SQL: Student’s t-test
Many undergraduates have misunderstood the name 'Students' in the t-test to imply that it was designed as a simple test suitable for students. In fact it was William Sealy Gosset, an Englishman publishing under the pseudonym Student, who developed the t-test and t distribution in 1908, as a way of making confident predictions from small sample sizes of normally-distributed variables. As Gosset's employer was Guinness, the brewer, Phil Factor takes a sober view of calculating it in SQL.
2017-10-12
3,767 reads
Blogs
macOS Tahoe breaks SQL Server on Docker containers on Apple silicon
The honeymoon is over, and macOS 26 Tahoe broke the Rosetta 2 emulation layer...
From Firefighting to Future‑Building: SQL Server 2025 and the New DataOps Mindset
By Chris Yates
There are moments in technology when the ground shifts beneath our feet. Moments when...
Why Developers Shouldn’t Have sysadmin access in SQL Server
Why Developers Shouldn’t Have sysadmin access in SQL Server 7 reasons—and exactly what to do instead It...
Forums
Extract from sql.to multiple sheets
Import-Module ImportExcel # Path to your .sql file $sqlFile = "C:\Data\MyQueries.sql" $excelPath = "C:\Data\SqlExtract_$(Get-Date...
sp_prepare and sp_execute vs sp_executesql
I have noticed sp_executesql also makes a single plan for a stmt with parameter...
Question of the Day
Who am I?
If I want to track which login called a stored procedure and use the value in an audit, what function can I use to replace the xxx below?
create procedure AddNewCustomer
@customername varchar(200)
AS
BEGIN
DECLARE @added VARCHAR(100)
SELECT @added = xxx
IF @customername IS NOT NULL
INSERT dbo.Customer
(
CustomerName,
AddedBy
)
VALUES
(@customername, @added)
END See possible answers