按一列的计数在mysql上排序

Question

I have a table

tid item
1   k1
1   k1
1   k1
1   k2
1   k2
2   k1
2   k3
3   k2
3   k1
3   k4

I want to order it from total item, so k1 appear 5 time,, than k2 appear 3 times, k3 and k4 once. I want to order it by tid asc, and count of item desc.

I tried this query,

SELECT * 
FROM `tes2` 
order by count(id_item) desc

But it just returns 1 row.

tid item
1   k1

How to get all of the data?

an output that i want is like this

 tid item
    1   k1
    1   k1
    1   k1
    1   k2
    1   k2
    2   k1
    2   k3
    3   k1
    3   k2
    3   k4

so its ordered by the count of item.

Answer 1

You can do this by using a subquery to get the count for each item and then join that to the main table on item so you can order by count. Below is MSSQL but you should be able to use this solution in your MySQL query.

Set up the test --

DECLARE @Test TABLE
( 
    tid int,
    tem VARCHAR(5)
)

INSERT into @Test (tid, item)   VALUES (1, 'k1');
INSERT into @Test (tid, item)   VALUES (1, 'k1');
INSERT into @Test (tid, item)   VALUES (1, 'k1');
INSERT into @Test (tid, item)   VALUES (1, 'k2');
INSERT into @Test (tid, item)   VALUES (1, 'k2');
INSERT into @Test (tid, item)   VALUES (2, 'k1')
INSERT into @Test (tid, item)   VALUES (2, 'k3');
INSERT into @Test (tid, item)   VALUES (3, 'k2');
INSERT into @Test (tid, item)   VALUES (3, 'k1');
INSERT into @Test (tid, item)   VALUES (3, 'k4');

Query --

SELECT  t.tid,t.item
FROM    @Test t
JOIN    (SELECT t2.Item, COUNT(*) AS ItemCount FROM @Test t2 GROUP BY t2.Item) counts ON counts.Item = t.Item
ORDER BY counts.ItemCount DESC, t.tid ASC

OUTPUT --

 tid    item
    1   k1
    1   k1
    1   k1
    2   k1
    3   k1
    1   k2
    1   k2
    3   k2
    2   k3
    3   k4

Answer 2

try this:

SELECT count(id_item), field1, field2, field3
FROM `tes2` 
order by 0 desc