Question

I have a temporary table I’m creating in a sproc that houses my user information. I need to join this table to another table that has SEVERAL rows for that particular user but I only want to return one result from the “many” table.

something like this

SELECT u.firstname, u.lastname
FROM #users AS u
INNER JOIN OtherTable AS ot on u.userid = (top 1 ot.userid)

obviously that wont’ work but that’s the gist of what I’m trying to do for two reasons, one I only want one row returned (by a date field descending) and two for optimaztion purposes. The query has to scan several thousand rows as it currently is..

Answer 1

SELECT
   u.firstname, u.lastname, t.*
FROM
   #users AS u
   CROSS APPLY
   (SELECT TOP 1 * 
    FROM OtherTable AS ot 
    WHERE u.userid = ot.userid
   ORDER BY something) t