How do I find the first day of the current week with SQL?

Have you ever had to do weekly/monthly reporting based on SQL data retrieval?

It would be pretty neat if you could get the start date of the current week/month dynamically, no?

Well, there’s a very straightforward way if you’re using Vertica or PostgreSQL – just employ the date_trunc(‘period’, timestamp) function.

Other databases (e.g. SQL Server,  MySQL) require some extra SQL conversions, but certainly not anything unfamiliar 😉

Remember how to:

That’s all you need to know in order to truncate a date in SQL Server and MySQL.

Assuming we’re dealing with Monday-to-Sunday week, the said calculations will be as follows:

Happy SQL-ing!

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