How to select random and unique number

hi all
suppose i have millions of rows in emp table
i want to select group of empno
group of records would be 10
all records uniquely selected
make sure all records are selected in any Group
thanks

BluShadow wrote:
Solomon Yakobson wrote:
3360 wrote:
It is the definition of random that the each value generated has an equal chance of being generated again. A coin toss is random despite the result only having two values.Absolutely. Except one little thing. The above applies if we randomly pick from same set. Now OP asked to randomly select group of objects. This is same as you have a set of unique objects and you randomly pick one and put it in your pocket. Then you randomly pick another object and put it in your pocket. So you end up with a UNIQUE set of randomly picked objects in your pocket. Now DBMS_RANDOM allows to specify low & high value but it doesn't allow to provide something like "pick N values" or except list to mimick "put in your pocket" part. That is why we have to write something like I suggested to OP.
SY.In that case it should just be an answer like...
select * from tablename where rownum <= 10because the order is not guaranteed without an order by clause and therefore that's just as random as needed to meet the requirements. ;)hi BluShadow
rownum surely give unique number of records but it will not A RANDOM....
thanks

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