Imagine I have a SQL Server table as shown below, named dbo.tblNAV:
Ticker ISIN Date Price ------------------------------------------ TSLA US88160R1014 2021-08-09 45454 TSLA US88160R1014 2021-08-10 45455 TSLA US88160R1014 2021-08-11 45456 TSLA US88160R1014 2021-08-12 45457 TSLA US88160R1014 2021-08-13 45458 TSLA US88160R1014 2021-08-16 45459
How can I select the data only for Mondays and Fridays?
I am a beginner in SQL Server and almost have no idea to handle this. I would appreciate your help.
I am using Microsoft SQL Server Management Studio.
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Answer
SQL Server does not make this easy to do across all systems. The problems are:
datename()returns the name of the week, but the language depends on local culture settings.datepart()returns the day of week number, but the start of the week depends on local settings.
If you are working in English, then you can use datename():
where datename(weekday, n.date) in ('Monday', 'Friday')
If you need a culture-independent method, then you can use format() with a culture argument:
where format(n.date, 'ddd', 'us-en') in ('Mon', 'Fri')