T-SQL: Selecting Column Based on MAX(Other Column)

Question

I\'m hoping there\'s a simple way to do this without using a sub-query:

Scenario: You have \"TableA\" with columns \"Key\", \"SubKey\", and \"Value\". I need to ge

Answer 1

OMG Ponies hit most of the ways to do it. Here's one more:

SELECT
    T1.value
FROM
    My_Table T1
LEFT OUTER JOIN My_Table T2 ON
    T2.key = T1.key AND
    T2.subkey > T1.subkey
WHERE
    T2.key IS NULL

The only time that T2.key will be NULL is when there is no match in the LEFT JOIN, which means that no row exists with a higher subkey. This will return multiple rows if there are multiple rows with the same (highest) subkey.