How to write sub query in laravel?

@dedrick 

To write a subquery in Laravel, you can use the DB::raw() method to write raw SQL code within your Eloquent query. Here is an example of how to write a subquery in Laravel:

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$subQuery = DB::table('table_name')
    ->select('column_name')
    ->where('condition', 'value');

$results = DB::table('main_table')
    ->select('*')
    ->where('column_name', 'IN', function($query) use ($subQuery){
        $query->select('column_name')
              ->fromDB::raw("($subQuery->toSql())");
    })
    ->mergeBindings($subQuery)
    ->get();

In this example, we first create a subquery using the DB::table() method, setting select and where conditions. We then use this subquery within the main query by passing it as a parameter to the where() method along with the DB::raw() method to execute the raw SQL code.

Remember to merge the bindings from the subquery using the mergeBindings() method to ensure the query is executed correctly.

This is just one way to write a subquery in Laravel and there may be other methods depending on your specific needs and database structure.