How to Sort Nullable Datetime Fields with Nulls Last in Ascending Order in SQL?

How to Handle Null Values in Ascending SQL Sort

When dealing with queries involving nullable datetime fields, users may encounter scenarios where they prefer null values to appear at the end of the ascendingly sorted results. By utilizing a straightforward SQL technique, we can easily achieve this.

To specify the desired sort order for null values, we can exploit the CASE statement:

select MyDate
from MyTable
order by case when MyDate is null then 1 else 0 end, MyDate

In this code, the CASE statement serves as a conditional expression that assigns either 1 or 0 to each row, depending on whether the MyDate value is null or not. By evaluating this expression first in the ORDER BY clause, we prioritize non-null values (assigned 0) over null values (assigned 1).

Consequently, the results will be ordered in ascending order of the MyDate values, while null values will be effectively grouped together at the end of the sorted list. This allows for a more informative and organized data representation.

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