2025-06-02
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Date Calculations
2024-06-10
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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
12,242 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
26,009 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
35,755 reads
2020-02-27
23,865 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
3,146 reads
2019-07-04
960 reads
2019-04-18
1,518 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)
1,984 reads
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Forums
Pay for Performance
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Helping an English Student with R
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Question of the Day
Adding Bits I
I have a table, dbo.bittest, where I am testing an application response. This has this structure:
CREATE TABLE [dbo].[BitTest] ( [insertdate] [datetime] NULL CONSTRAINT [DF__BitTest__insertd__300F11AC] DEFAULT (getdate()), [a] [bit] NULL ) ON [PRIMARY] GOMy application runs this code:
INSERT dbo.BitTest
(
insertdate,
a
)
VALUES
(DEFAULT, 'true')
GO
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