select only duplicate employee numbers

5 pts.
Tags:
Database
How does one select only duplicate employee numbers to be printed? Sounds simple?

Answer Wiki

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Hi,

In SQL, you can use GROUP BY … HAVING.

To get a distinct list of the duplicate numbers:

<pre>
SELECT employee_number
FROM table_name
GROUP BY employee_number
HAVING COUNT (*) > 1;
</pre>

To find all the records that have one of those numbers, use the IN operator with the query above:

<pre>
SELECT *
FROM table_name
WHERE employee_number IN
( — Begin sub-query to find duplicate employee_numbers
SELECT employee_number
FROM table_name
GROUP BY employee_number
HAVING COUNT (*) > 1
) — End sub-query to find duplicate employee_numbers
;
</pre>

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  • ITKE
    Can you provide more information as to what program you are using etc. thanks
    334,795 pointsBadges:
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