2025-06-02
510 reads
Date Calculations
2024-06-10
485 reads
SQL Window Functions Series: LAG() and LEAD()
Dive deep into the powerful SQL window functions, LAG() and LEAD(). Explore their intricacies, discover real-world examples, and avoid common pitfalls.
2023-12-11
8,931 reads
Combine DATE and TIME to DATETIME2 in SQL Server
The most common method on the internet for combining DATE and TIME columns in SQL Server is incorrect. This article demonstrates why that and other methods are incorrect and two lesser known high performance methods that produce correct results even for the "edge cases".
2023-08-07
23,485 reads
How to Find the Start and End Dates for the Current Week (and more)
Learn to calculate Start / First of Week, End of Week, Start of Next Week, Year, Quarter, and Month of the week, Week Numbers and more in T-SQL (Jeff Moden)
2022-07-13
33,588 reads
2020-02-27
23,386 reads
Politics makes for bad databases - plus calculate British holidays
In this piece, learn about changes in UK holidays and get a script to calculate them.
2019-07-15
3,071 reads
2019-07-04
903 reads
2019-04-18
1,472 reads
Function for Getting Interval Dates by days,months,years.
Function for Getting Interval Dates by days,months,years for particular week number, for particular month, for particular date between 1 to 31. etc...
All in One Date Interval Related Function.
2016-06-27 (first published: 2015-11-27)
1,938 reads
Blogs
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Forums
The AI Bubble and the Weak Foundation Beam
Comments posted to this topic are about the item The AI Bubble and the...
data type gets lost in data flow
Hi, in a simple oledb source->derived column->oledb destination data flow, 2 of my...
i noticed the sqlhealth extende event is on by default , so can i reduce
hi, i noticed the sqlhealth extended event is on by default , and it...
Question of the Day
The Read Committed Snapshot Isolation behaviour
I am currently working with Sql Server 2022 and AdventureWorks database. First of all, let's set the "Read Committed Snapshot" to ON:
use master; go alter database AdventureWorks set read_committed_snapshot on with no_wait; goThen, from Session 1, I execute the following code:
--Session 1 use AdventureWorks; go create table ##t1 (id int, f1 varchar(10)); go insert into ##t1 values (1, 'A');From another session, called Session 2, I open a transaction and execute the following update:
--Session 2 use AdventureWorks; go begin tran; update ##t1 set f1 = 'B' where id = 1;Now, going back to Session 1, what happens if I execute this statement?
--Session 1 select f1 from ##t1 where id = 1;See possible answers