Question

I have a table of 5000 records with a date column.

How do I find the average of those dates. I’ve tried AVG(datefield), but it says Operand data type datetime is invalid for avg operator

Answer 1

If you want to average date only:

SELECT CAST(AVG(CAST(datefield AS INT)) AS DATETIME) FROM dates;

And if you want to consider time:

SELECT CAST(AVG(CAST(datefield AS FLOAT)) AS DATETIME) FROM dates;

See fiddle to test.