Feature: no table support

[skipperbent]

Added support for not defining any table (so calling QueryBuilderHandler()->table() is no longer required).

Can be useful for situations where you are using multiple subqueries to generate the rows without doing a specific query to any tables.

SQL Example:

SELECT (SELECT COUNT(*) FROM `mail`) as mail_count, (SELECT COUNT(*) FROM `event_message`) as message_count

Pixie example:

$subQuery1 = $this->builder->table('mail')->select($this->builder->raw('COUNT(*)'));
$subQuery2 = $this->builder->table('event_message')->select($this->builder->raw('COUNT(*)'));

$count = $this->builder->select($this->builder->subQuery($subQuery1, 'row1'), $this->builder->subQuery($subQuery2, 'row2'))->first();

I've created tests for this, which can be found in the NoTableSubQueryTest test-class.

[TCB13]

This is useful :)

[skipperbent]

I've added this and multiple other useful features in my custom fork, available here:

https://github.com/skipperbent/pecee-pixie

[TCB13]

@skipperbent maybe you should PR all your changes to this project. The maintainer of this one had some heath complications lately but he is back.

[TCB13]

@usmanhalalit please merge!