How to alias a table in Laravel Eloquent queries (or using Query Builder)?

Question

Lets say we are using Laravel's query builder:

$users = DB::table('really_long_table_name')
           ->select('really_long_table_name.id')
           ->get();

I'm looking for an equivalent to this SQL:

really_long_table_name AS short_name

This would be especially helpful when I have to type a lot of selects and wheres (or typically I include the alias in the column alias of the select as well, and it gets used in the result array). Without any table aliases there is a lot more typing for me and everything becomes a lot less readable. Can't find the answer in the laravel docs, any ideas?

Answer 1

Laravel supports aliases on tables and columns with AS . Try

$users = DB::table('really_long_table_name AS t')
           ->select('t.id AS uid')
           ->get();

Let's see it in action with an awesome tinker tool

$ php artisan tinker
[1] > Schema::create('really_long_table_name', function($table) {$table->increments('id');});
// NULL
[2] > DB::table('really_long_table_name')->insert(['id' => null]);
// true
[3] > DB::table('really_long_table_name AS t')->select('t.id AS uid')->get();
// array(
//   0 => object(stdClass)(
//     'uid' => '1'
//   )
// )

Answer 2

To use aliases on eloquent models modify your code like this:

Item
    ::from( 'items as items_alias' )
    ->join( 'attachments as att', DB::raw( 'att.item_id' ), '=', DB::raw( 'items_alias.id' ) )
    ->select( DB::raw( 'items_alias.*' ) )
    ->get();

This will automatically add table prefix to table names and returns an instance of Items model. not a bare query result. Adding DB::raw prevents laravel from adding table prefixes to aliases.

Answer 3

Here is how one can do it. I will give an example with joining so that it becomes super clear to someone.

$products = DB::table('products AS pr')
        ->leftJoin('product_families AS pf', 'pf.id', '=', 'pr.product_family_id')
        ->select('pr.id as id', 'pf.name as product_family_name', 'pf.id as product_family_id')
        ->orderBy('pr.id', 'desc')
        ->get();

Hope this helps.

Answer 4

To use in Eloquent. Add on top of your model

protected $table = 'table_name as alias'

//table_name should be exact as in your database

..then use in your query like

ModelName::query()->select(alias.id, alias.name)

Answer 5

You can use less code, writing this:

    $users = DB::table('really_long_table_name')
       ->get(array('really_long_table_name.field_very_long_name as short_name'));

And of course if you want to select more fields, just write a "," and add more:

 $users = DB::table('really_long_table_name')
       ->get(array('really_long_table_name.field_very_long_name as short_name', 'really_long_table_name.another_field as other', 'and_another'));

This is very practical when you use a joins complex query

Answer 6

I have tried all these options and none works for me. Then I had found something in the Laravel documentation that really works.

You could try this:

DB::table('table_one as t1')
    ->select(
        't1.field_id as id','t2.field_on_t2 as field'
     )->join('table_two as t2', function ($join) {
        $join->on('t1.field_id ', '=', 't2.field_id');
    })->get()

Answer 7

Also note that you can pass an alias as the second parameter of the table method when using the DB facade:

$users = DB::table('really_long_table_name', 'short_name')
           ->select('short_name.id')
           ->get();

Not sure if this feature came with a specific version of Laravel or if it has always been baked in.

Answer 8

与AMIB答案相同，对于软删除错误“未知列'table_alias.deleted_at'”，只需添加->withTrashed()然后自己处理它->whereRaw('items_alias.deleted_at IS NULL')

Answer 9

In the latest version of Laravel 9, you can use alias name for column as:

$events = Booking::whereBetween('sessionDateTime', [$today, $nextMonth])->get(['bookings.sessionDateTime as start']); // start is an alias here