Need Assistance With Finding Duplicate Entries in a Table Combining Three Columns

 Hi Folks

i have a table of data that may have duplicate entries combining first three columns within the same table
can someone tell me how i would extract the duplicates if there are any from that table ?

example table:
table 1

example columns:

parentid,
ownerid,
name,
indate,
outdate,
dataid

want to select on first first three columns combined together:

parentid||ownerid||name

Any Assistance is Appreciated

Jim