get count column to all the records in sql return records

Question

I need to get the count of records and need to display the result by duplicating in all of the records in the return result.

{
    "id": 1,
    "count1": "5"
}

As the json response currently I received the above output. But I need it is as follows.

{
    "id": 1,
    "count1": "5"    
},
{
    "id": 2,
    "count1": "5"    
},
{
    "id": 3,
    "count1": "5"    
}

My attempted query as below.

 $query = 'SELECT c.id, count(c) count1 FROM App\Entity\Car c';

How can I achieve my expected result?

Answer 1

If you have a numbers table, you can do:

SELECT c.id, n.n, count1
FROM (SELECT c.id, count(c) as count1
      FROM `App\Entity\Car` c
      GROUP BY c.id
     ) c JOIN
     numbers n
     ON n.n <= c.count1;

If you don't you can generate one on the fly if your table is big enough:

SELECT c.id, n.n, count1
FROM (SELECT c.id, count(c) as count1
      FROM `App\Entity\Car` c
      GROUP BY c.id
     ) c JOIN
     (SELECT (@rn := @rn + 1) as n
      FROM numbers n CROSS JOIN
           (SELECT @rn := 0) params
     ) n
     ON n.n <= c.count1;