code: protected function build_sql() {
  
  		$builder = new Builder();
  
  		$select = $this->parse_select();
  		$from   = new From( $this->table->get_table_name( $GLOBALS['wpdb'] ), 'q' );
  
  		$where = new Where( 1, true, 1 );
  
  		if ( ( $message = $this->parse_message() ) !== null ) {
  			$where->qAnd( $message );
  		}
  
  		if ( ( $level = $this->parse_level() ) !== null ) {
  			$where->qAnd( $level );
  		}
  
  		if ( ( $user = $this->parse_user() ) !== null ) {
  			$where->qAnd( $user );
  		}
  
  		if ( ( $group = $this->parse_group() ) !== null ) {
  			$where->qAnd( $group );
  		}
  
  		if ( ( $time = $this->parse_time() ) !== null ) {
  			$where->qAnd( $time );
  		}
  
  		$order = $this->parse_order();
  		$limit = $this->parse_pagination();
  
  		$builder->append( $select )->append( $from );
  
  		$builder->append( $where );
  		$builder->append( $order );
  
  		if ( $limit !== null ) {
  			$builder->append( $limit );
  		}
  
  		return $builder->build();
  	}
docs: Build the sql query.
  
  @since 1.0
  
  @return string