Understanding the Basics
In today's video, we're diving into the SQL Server ROUND function. Let's kick things off by exploring a real-world example using the Adventure Works database's Product table. You can access the SQL script and product table on GitHub, and I'll guide you through the process. We'll be focusing on the 'ListPrice' field, a money data type with precision up to four decimal places.
The Challenge of Decimal Places
Column one displays the 'ListPrice,' but things get interesting when we move to column two, dividing the list price by three. This division introduces more decimal places, and this is where the ROUND function becomes invaluable.
The Round Function in Action
Column two showcases the magic of the ROUND function. By applying ROUND to the list price divided by three, we can control the precision to meet our needs. Whether rounding to the nearest penny, dime, dollar, or even a hundred dollars, the ROUND function proves its flexibility.
ROUND(ListPrice / 3, 2) AS Rnd_Nearest_Penny, -- Hundreth
ROUND(ListPrice / 3, 1) AS Rnd_Nearest_Dime, -- Tenth
ROUND(ListPrice / 3, - 0) AS Rnd_Nearest_Ones, -- Ones
ROUND(ListPrice / 3, - 1) AS Rnd_Nearest_Tens, -- Tens
ROUND(ListPrice / 3, - 2) AS Rnd_Nearest_Hundreds -- Hundreds
Key Takeaways and Tips
Remember to cast the result as numeric if needed, especially when working with non-numeric fields.
The ROUND function adapts to your precision requirements, making it a versatile tool for various scenarios.
Negative rounding is your ally when you need to round to the left of the decimal point.
Conclusion
There you have it! The SQL Server ROUND function can be a useful tool. I hope this guide empowers you to wield this function confidently in your SQL adventures. Have a fantastic day!
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