Question

I have a temporary table #temp that has following records:

col1    col2
a       11
a       12
a       13
b       5
b       8

I want to only keep records that have max col2, the result table should be like

col1    col2
a       13
b       8

can anybody help me to write the query without creating another temp table?

Answer 1

DELETE t1
FROM dbo.test74 t1
WHERE NOT EXISTS (
                  SELECT 1
                  FROM dbo.test74 t2
                  WHERE t2.col = t1.col              
                  HAVING MAX(t2.col2) = t1.col2
                  )

Demo on SQLFiddle