Question

how to fetch the last inserted (datetime) records for each category in database table

like:

select top 1 from table1, table2

where condition1 ...

and condition2 = case when (@var1 = null) then table2.condition2 else @var1

— for all categories if a specific one is not passed

order by Creation_Date

Any help is appreciated (esp. sample code). Thanks in advance.

Answer 1

I would use analytical functions

SELECT *
FROM
(
  SELECT ROW_NUMBER() OVER (PARTITION BY category ORDER BY Creation_Date DESC) RN, *
  FROM table
  WHERE condition1
) T
WHERE T.RN = 1