How to select some rows with specific values and sort them in mysql

Question

I have a MYSQL database with some columns and rows. And I want to select some of rows with same value and sum them and then sort them.

for example:

something like : data : (16 id : 1) , (data : 14 id : 2) , (data : 44 id : 4)

for doing this I tried this code :

$sql = "SELECT id, SUM(data) AS value_sum FROM table GROUP BY id ORDER BY value_sum DESC LIMIT 30";
$result = mysqli_query($conn, $sql);

    $ids = "";
    $datas = "";

    if (mysqli_num_rows($result) > 0) {
        while ($row = mysqli_fetch_assoc($result))
        {
            $ids .= $row['p_id'] . '^';
            $datas.= $row['value_sum'] . '^';
        }
    }

And it works fine and I can get sum of rows values sorted as value_sum.

But my problem is the ids are not sorted and I want to get sorted ids too but the result is not sorted. I mean in the result i don't know can I get true id for value_sum.

for more explanation I want this result :

(id 4 : 44) , (id 1 : 16) , (id 2 : 14)

How can I do this ?

You can order by as many columns as you like in an order by so I'm not clear what you mean by ' i don't know can I get true id for value_sum.' — P.Salmon
– P.Salmon, Commented Jun 23, 2019 at 11:52

ScaisEdge · Accepted Answer · 2019-06-23 12:20:17Z

1

you could use sum() , group by and order by sum and id

select  id, sum(data) , concat('(id ',id, ':', sum(data) , ')')
from my_table  
group by  id   
order by sum(data) desc, id asc

or

select  id, sum(data) 
from my_table  
group by  id  
order by id asc, sum(data) desc

and if you need on the same rows

select group_concat(my_col) 
from  (
select  id, sum(data) , concat('(id ',id, ':', sum(data) , ')') my_col
from my_table  
group by  id   
order by sum(data) desc, id asc ) t

edited Jun 23, 2019 at 12:20

answered Jun 23, 2019 at 11:47

ScaisEdge

133k10 gold badges98 silver badges111 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

iman_sh Over a year ago

I tried this but the ids are not match with value_sums

iman_sh Over a year ago

i mean ids are sorted by rows not with value_sum

ScaisEdge Over a year ago

your comments are not clear .. update you question add a clear expected result as a tabular result .. (what mean id are sorted by rows not by sum????)

iman_sh Over a year ago

i update that. i mean this part : id asc , only sorts ids by rows index. but what i want is sorted ids with 'sum(data)' result. @scaisEdge

ScaisEdge Over a year ago

answer update .. based on your sample (id 4 : 44) , (id 1 : 16) , (id 2 : 14)

Collectives™ on Stack Overflow

How to select some rows with specific values and sort them in mysql

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related