What's the Most Efficient Way to Extract Date from DateTime in SQL Server?

Optimizing Date Extraction from DateTime in SQL Server

Extracting just the date portion from a datetime field is a common SQL Server task. This article benchmarks several methods to identify the most efficient approach.

Method Comparison: Floor-Cast, String Conversion, and DateAdd

We evaluated three popular techniques: a floor-cast conversion (converting to float, then using FLOOR), string conversion (using CONVERT to extract the date string), and a DateAdd strategy (using DATEDIFF and DATEADD to remove the time component).

The floor-cast method, while innovative, didn't prove the fastest in our tests. String conversion, a frequently used method, also performed slower than other options. Surprisingly, the DateAdd method consistently outperformed the others, achieving execution times as low as 531 milliseconds in our benchmark tests. It proved to be the slightly faster option than the floor-cast method.

Performance Analysis and Recommendations

While optimal performance might vary based on individual system setups and data volume, our testing suggests the DateAdd strategy offers a robust and efficient solution for extracting dates from datetime values in SQL Server. It provides a good balance of speed and reliability.

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