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
11,472 reads
Date computation
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
25,517 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
35,313 reads
Add working days but avoid holidays
A function to add or subtract working days taking into account weekends and using a table of non-working days.
2019-07-10 (first published: 2019-06-26)
5,253 reads
2018-02-23 (first published: 2018-02-19)
185 reads
2017-12-29
1,112 reads
Compute Holiday Day of the Month for any Year
This script provides the day of the month for the standard bank holidays for any given year. This is especially useful for computing the workday after a holiday.
2017-05-24 (first published: 2017-05-10)
529 reads
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Adding new column with DEFAULT
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How do I connect to a SQL Server database on my ISP?
I've got a web application for my side business. I've added a SQL Server...
Question of the Day
Adding new column with DEFAULT
Which number will the COUNT() return after executing the following statements:
DROP TABLE IF EXISTS #test; CREATE TABLE #test (id INT) INSERT INTO #test (id) SELECT * FROM GENERATE_SERIES(1, 3) AS gs ; ALTER TABLE #test ADD flag BIT CONSTRAINT DF_#test_flag DEFAULT 0; go UPDATE #test SET flag = 0 WHERE id = 1 UPDATE #test SET flag = 1 WHERE id = 2 INSERT INTO #test (id) VALUES (4) SELECT COUNT(*) FROM #test AS t WHERE flag = 0See possible answers