Question

If I have a table with two columns, name and timestamp, and a bunch of rows that will have shared names. How do I select the most recent row of each set of rows that shares the same name?

Thanks!

Answer 1

SELECT name, MAX(timestamp) FROM Table1 GROUP BY name

EDIT: Based on the comment, please try the following:

SELECT name, timestamp, col3, col4
FROM   Table1 t1
WHERE  timestamp = (SELECT MAX(t2.timestamp)
              FROM Table1 t2
              WHERE t1.name = t2.name);

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Added by Mchl

Version with no dependent subquery (should perform better)

SELECT 
  t1.name, t1.timestamp, t1.col3, t1.col4
FROM   
  Table1 AS t1
CROSS JOIN (
  SELECT 
    name, MAX(timestamp) AS timestamp
  FROM 
    Table1
  GROUP BY
     name
) AS sq
USING (name,timestamp)