Counting rows for the column in mysql - mysql

Question

My problem is simple. I have two tables
transaction_bodies
------------------
body_id
full_name
and the other one is
transaction_accounts
--------------------
account_id
body_id
account_name
Relation is one to many. One body can have multiple accounts. I am trying to create a query that counts the accounts that bodies have.
I tried this
SELECT *
FROM
(
SELECT count(*) as trans, tb.full_name
FROM transaction_accounts ta
LEFT JOIN transaction_bodies tb
ON tb.body_id = ta.body_id
) as row;
But this doesn't give the right result. Can anyone help me out with this?
And if can provide how to write sub-queries in Laravel that would be a appreciated much.

Answer 1

Try this :
$result = DB::table('transaction_bodies')
->leftJoin('transaction_accounts as
ta','transaction_bodies.body_id','ta.body_id')
->select(DB::raw('count(ta.account_id) AS trans'),'transaction_bodies.full_name')
->groupBy('transaction_bodies.body_id')
->get();

Answer 2

You can do it with LEFT JOIN, e.g.:
SELECT tb.body_id, COUNT(ta.*)
FROM transaction_bodies LEFT JOIN transaction_accounts ta
ON tb.body_id = ta.body_id
GROUP BY tb.body_id;

Answer 3

With a simple LEFT JOIN you can achieve it like
SELECT tb.full_name, COUNT(account_id) as accounts
FROM transaction_bodies tb LEFT JOIN transaction_accounts ta
ON tb.body_id = ta.body_id
GROUP BY tb.body_id;
In Laravel you can do it like with model
$accounts = Transaction_body::leftJoin('transaction_accounts as ta','transaction_bodies.body_id','ta.body_id')->groupBy('transaction_bodies.body_id')->get();
without model
$accounts = DB::table('transaction_bodies')->leftJoin('transaction_accounts as ta','transaction_bodies.body_id','ta.body_id')->groupBy('transaction_bodies.body_id')->get();

Answer 4

/**
* Class Body
*/
class Body extends Model
{
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'transaction_bodies';
/**
* Get the accounts for the Transaction Body.
*/
public function accounts()
{
return $this->hasMany(Account::class);
}
}
/**
* Class Account
*/
class Account extends Model
{
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'transaction_accounts';
/**
* Get the body that owns the account.
*/
public function body()
{
return $this->belongsTo(Body::class);
}
}
//usage
$accounts = Body::find(1)->accounts;
https://laravel.com/docs/5.4/eloquent-relationships#one-to-many