oracle - Subtract one hour from datetime rather than one day -


i have datetime column in oracle (mm/dd/yyyy hh:mm:ss am/pm) when this:

select max(d_dtm)-1 tbl1

...it goes day. how remove 1 hour column rather 1 day?

i've noticed datetime records 12am mm/dd/yyyy , not mm/dd/yyyy 00:00:00; i'm not sure if matters.

randy's answer good, can use intervals:

select max(d_dtm)- interval '1' hour tbl1

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