SQL Query - Help on Query : Table has 3 fields and sample data.

    customerid,ordertype,countoforders
    1,         APP,        10
    1,         WEB,        20
    2,         APP,        10
    3,         WEB,        10
    4,         APP,        30
    5,         APP,        40
    5,         WEB,        10

I want to retrieve only APP order customers and its counts. Can you please let me know how to write the query for the same.

For example from above table APP only customers are 2 and 4. Please assist me.
