how to get latet entry of a item when item have multiple rows?
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        Published on 2010-05-20T07:15:33Z
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            7:20 UTC
        
        
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mysql-query
i have an table
tbl_exp
 id| exp_id|qnty|     last_update
 1 |   12  |  10|2010-05-18 19:34:29
 2 |   13  |  50|2010-05-19 19:34:29
 3 |   12  |  50|2010-05-19 19:34:29
 4 |   15  |  50|2010-05-18 19:34:29
 5 |   18  |  50|2010-05-20 19:34:29
 6 |   13  |  70|2010-05-20 19:34:29
now i need only latest entry of each exp_id
 id| exp_id|qnty|     last_update
 3 |   12  |  50|2010-05-19 19:34:29
 6 |   13  |  70|2010-05-20 19:34:29
 4 |   15  |  50|2010-05-18 19:34:29
 5 |   18  |  50|2010-05-20 19:34:29
please suggest me the mysql query to retrive above result??
thanks!
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