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Find the One Random Set_id from each unique Skill_id


By : kunal
Date : October 17 2020, 06:10 AM
Does that help I have my set table where there is set of question papers, There are 2 sets of question for each skills, I am looking to get any one random set of paper for each unique skill_id. , you can use order by newid() to do the randomization
code :
select *
from
(
    select set_id, skill_id, set_name,
           rn = row_number() over (partition by skill_id order by newid())
    from   ques_set 
    where  skill_id in (1,2,3,5)
) as d
where d.rn = 1


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Flicker API issues, set_id


By : user1986369
Date : March 29 2020, 07:55 AM
Any of those help per the api documentation, it is not a valid field for that method
if you use the getList method of a set, you can specify a user.

Searching in table to find if IP address exists for a set_id


By : Studio Game Free
Date : March 29 2020, 07:55 AM
seems to work fine I have reached a stumbling block in my project and need some guidance. I need to implement a model query that returns a mysql_num_rows - I think. What i am trying to do is on my page I have a rating widget that records the IP address of the person voting. I do not want the person to vote more than once. When i do a return mysql_num_rows, i get an error saying , You should use the resource in your query:
code :
public function getRatingByIp($ipAddress)
{
    $sql = "SELECT ip_address FROM " . $this->_prefix . " media_set_rating WHERE set_id = " . $ipAddress);
    $result = mysql_query($sql);
    return mysql_num_rows($result);
}

Best algorithm to find N unique random numbers in VERY large array


By : user3640785
Date : March 29 2020, 07:55 AM
may help you . If the odds of hitting a non-unique value are low, your best bet will be to select 3 random numbers from the array, then check each against the entire array to ensure it is unique - if not, choose another random sample to replace it and repeat the test.
If the odds of hitting a non-unique value are high, this increases the number of times you'll need to scan the array looking for uniqueness and makes the simple solution non-optimal. In that case you'll want to split the task of ensuring unique numbers from the task of making a random selection.

Can't find a way to create unique random numbers...(BINGO game)


By : chocolater
Date : March 29 2020, 07:55 AM
wish of those help If you just need random doubles, you can instantiate a Random outside your loop and keep using the same instance with random.nextDouble() to get pseudorandom numbers.
code :
Random random = new Random();
for (int p = 0; p < b.length; p++) {
   b[p] = (int) (random.nextDouble() * 14 + 1);
   do {
      b[1] = (int) (random.nextDouble() * 14 + 1);
   } while (b[1] == b[0]);
...
}

Find 2nd maximum start_date for a group of set_id in big query


By : alfian afief nurtams
Date : March 29 2020, 07:55 AM
Hope that helps First filter only records which have status = 'C', then use window functions to partition data by set_id and order by start_date inside each set. Then take 2nd value.
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