sql - How to Count Duplicate Values in One Table? -

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i have view following table/sample values: 

parentid, childcontainerid, childid 1         ccid1                cid1 1         ccid1                cid2 1         ccid2                cid1 1         ccid2                cid2 1         ccid2                cid3 2         ccid3                cid1 2         ccid3                cid2 2         ccid3                cid2 2         ccid4                cid5 2         ccid4                cid2 2         ccid5                cid5

my goal craft query return duplicate child's across parent id (disregarding childcontainerid)

so example data above following result 

parentid, childid, countchildid 1         cid1     2 2         cid2     3 2         cid5     2

i've tried number of different queries aren't working , think i'm frustrated , overlooking simple @ point.

any ideas? 

select parentid,        chilid,        count(*) countchildid yourtable group parentid,          chilid having count(*) > 1

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