Question

I need to create query like (i’m using PostgreSQL):

(SELECT * FROM t1 WHERE a>b ORDER BY a DESC)  
UNION ALL  
(SELECT * FROM t1 WHERE a<b ORDER BY a DESC)  

So, I’m trying to use query builder

$query1 = DB::select('*')  
->from('t1')->where('a', '>', 'b')->order_by('a', 'desc');    

$query2 = DB::select('*')  
->from('t1')->where('a', '<', 'b')->order_by('a', 'desc');    

$result = $query1->union($query2, TRUE);  

But in result i have sql query where selects without brackets. Like this:

SELECT * FROM t1 WHERE a>b ORDER BY a DESC  
UNION ALL  
SELECT * FROM t1 WHERE a<b ORDER BY a DESC  

And get SQL syntax error… Sorry for my english

Answer 1

Why not SELECT * FROM t1 WHERE a != b ORDER BY a DESC?

EDIT
For more complex query, when you really need two or more ORDER BY, I can see only this solution:

$query1 = DB::select()
        ->from('t1')
        ->where('a', '>', 'b')
        ->order_by('a', 'DESC')
        ->__toString();


$query2 = DB::select()
        ->from('t1')
        ->where('a', '<', 'b')
        ->order_by('a', 'DESC')
        ->__toString();

$query3 = '(' . $query1 . ') UNION ALL (' . $query2 . ')';
$result = DB::query(Database::SELECT, $query3)->execute();