sql - How do I find duplicate values in a table in Oracle? -

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what's simplest sql statement return duplicate values given column , count of occurrences in oracle database table?

for example: have jobs table column job_number. how can find out if have duplicate job_numbers, , how many times they're duplicated?

select column_name, count(column_name) table group column_name having count (column_name) > 1;

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