Delete records from a table where < max number for a field and keep highest number

Question

I know this sounds rather confusing but I'm at a loss how to explain it better. I have a table simplified below:

DB Type       ID
================
Table1         1                 
Table1         2                 
Table1         3                 
Table1         4                 
Table1         5                 
Table2         6                 
Table2         7                 
Table2         8                 
Table2         9                 
Table2        10 

what i am trying to achieve is to basically clean out this table but keep the record with the highest ID for each DB Type if that makes sense - so in this case it would be (Table1,5) and (Table2,10) with all other records being deleted. Is it possible to do this exclusively through MySQL?

* EDIT ***

Answer thanks to tips from Yogendra Singh

DELETE FROM MyTable WHERE ID NOT IN (SELECT * FROM (SELECT MAX(ID) from MyTable GROUP BY DB Type) AS tb1 ) ORDER BY ID ASC

Answer 1

TRY selecting the max ID group by db_type first and then use it as sub query with not in .

 DELETE FROM MyTable 
 WHERE ID NOT IN 
    (SELECT ID FROM 
      (SELECT MAX(ID) AS ID from MyTable GROUP BY DB Type) AS tb1
    )

EDIT:

 DELETE FROM MyTable
 HAVING MAX(ID) > ID;

Answer 2

delete your_table
from
  your_table left join
  (select max(id) max_id from your_table group by type) mx
  on your_table.id=mx.max_id
where mx.max_id is null

Subquery returns the maximum id for every type, and those are the values to keep. With an left join i'm selecting all the rows from your table that don't have an in in max_ids, and those are the rows to delete. This will work only if id is primary key, otherwise we have to join also the type.

Answer 3

Is the combination DB Type - ID unique?

If so, you can attack this in two stages:

1. Get only the rows you want

    SELECT [DB Type], Max(ID) AS MaxID FROM YourTable GROUP BY [DB Type] 

2. Delete the rest (Wrapping the previous statement into a more complicated statement; don't mean that)

    DELETE FROM YourTable FROM YourTable LEFT JOIN (SELECT [DB Type], Max(ID) AS MaxID FROM YourTable GROUP BY [DB Type]) DontDelete ON YourTable.[DB Type]=DontDelete.[DB Type] AND YourTable.ID=DontDelete.MaxID WHERE DontDelete.[DB Type] IS NULL 

Answer 4

DELETE FROM MyTable del
WHERE EXISTS ( 
    (SELECT * 
     FROM MyTable xx
     WHERE xx."db Type" = del."db Type"
     AND xx.id > del.id
     );

Answer 5

delete from my_Table  
 where Day in (select  MAX(day) d from my_Table   where id='id')