fix SqlServer compilation for delete with JOINs and using table aliases

src/Illuminate/Database/Query/Grammars/SqlServerGrammar.php

@@ -269,7 +269,13 @@ protected function compileDeleteWithJoins(Builder $query, $table, $where)
     {
         $joins = ' '.$this->compileJoins($query, $query->joins);
 
-        return trim("delete {$table} from {$table}{$joins} {$where}");
+        $alias = $table;
+
+        if (strpos(strtolower($table), ' as ') !== false) {
+            $alias = explode(' as ', $table)[1];
+        }
+
+        return trim("delete {$alias} from {$table}{$joins} {$where}");
     }
 
     /**

tests/Database/DatabaseQueryBuilderTest.php

@@ -1448,6 +1448,11 @@ public function testDeleteWithJoinMethod()
         $result = $builder->from('users')->join('contacts', 'users.id', '=', 'contacts.id')->where('email', '=', 'foo')->delete();
         $this->assertEquals(1, $result);
 
+        $builder = $this->getSqlServerBuilder();
+        $builder->getConnection()->shouldReceive('delete')->once()->with('delete [a] from [users] as [a] inner join [users] as [b] on [a].[id] = [b].[user_id] where [email] = ?', ['foo'])->andReturn(1);
+        $result = $builder->from('users AS a')->join('users AS b', 'a.id', '=', 'b.user_id')->where('email', '=', 'foo')->orderBy('id')->limit(1)->delete();
+        $this->assertEquals(1, $result);
+
         $builder = $this->getSqlServerBuilder();
         $builder->getConnection()->shouldReceive('delete')->once()->with('delete [users] from [users] inner join [contacts] on [users].[id] = [contacts].[id] where [users].[id] = ?', [1])->andReturn(1);
         $result = $builder->from('users')->join('contacts', 'users.id', '=', 'contacts.id')->delete(1);