Question

What is the correct way to achieve such a query (not working) ?

SELECT Min(mydates_col) as oldest, Max(mydates_col) as newest,
COUNT(oneparticular_column)  FROM  mytable WHERE mydates_col BETWEEN oldest AND newest

I understand I can do that using 2 consecutive queries, fetching the min and max dates from the first query, then using thoses numbers to run a second query but I’m convinced there is a much better solution, not found after dozen of tries.

Thx.

Answer 1

Use inner query, not very nice (see my comments) but if you need to:

SELECT COUNT(oneparticular_column)  FROM  mytable WHERE mydates_col BETWEEN (SELECT Min(mydates_col) FROM  mytable) AND (SELECT Max(mydates_col) FROM  mytable)