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mysql> select *, count(*) as count from table-name group by field1, field2, ... having count(*) >1; |
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Get median generally
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There are some useful group by functions in MySQL, like avg(), std(), max() and so on, but there is not a median function. Following SQL statement is a general way to achieve this purpose
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SELECT m.name, avg(m.medians) medians from (
SELECT x.name, x.val medians
FROM A x, A y
WHERE x.name=y.name
GROUP BY x.name, x.val
HAVING SUM(y.val <= x.val) >= COUNT(*)/2
AND SUM(y.val >= x.val) >= COUNT(*)/2
)AS m group by m.name;
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