SQL: How To Use DateDiff + ORDER BY with INNER JOIN

Question

Here is my existing SQL statement:

SELECT TOP 10 Users.FirstName + ' ' + Users.LastName AS Name,
              Feeds.LogType,
              Feeds.LogDesc,
              Feeds.Timestamp = DATEDIFF(MINUTE, Feeds.Timestamp, CURRENT_TIMESTAMP)
FROM Feeds
INNER JOIN Users ON Feeds.UserID = Users.UserID
ORDER BY Feeds.Timestamp DESC

I am having errors on the 2nd line, Incorrect syntax near '='.

Any ideas how to fix this?

Answer 1

Try

SELECT TOP 10 Users.FirstName + ' ' + Users.LastName AS NAME
    ,Feeds.LogType
    ,Feeds.LogDesc
    ,DATEDIFF(MINUTE, Feeds.TIMESTAMP, CURRENT_TIMESTAMP)
FROM Feeds
INNER JOIN Users ON Feeds.UserID = Users.UserID
ORDER BY DATEDIFF(MINUTE, Feeds.TIMESTAMP, CURRENT_TIMESTAMP) DESC

Answer 2

Feeds.Timestamp = DATEDIFF(MINUTE, Feeds.Timestamp, CURRENT_TIMESTAMP) should be

DATEDIFF(MINUTE, Feeds.Timestamp, CURRENT_TIMESTAMP) AS Timestamp 

Answer 3

Instead of = try alias name as,

SELECT TOP 10 Users.FirstName + ' ' + Users.LastName AS Name, Feeds.LogType,
    Feeds.LogDesc,
    DATEDIFF(MINUTE, Feeds.Timestamp, CURRENT_TIMESTAMP) [Timestamp]
FROM Feeds INNER JOIN Users ON Feeds.UserID = Users.UserID
ORDER BY Feeds.Timestamp DESC

Answer 4

You can use alias in the manner "alias = value", but you should not specify table name, so

Timestamp = DATEDIFF(MINUTE, Feeds.Timestamp, CURRENT_TIMESTAMP)