Построение дерева, единственный выход?

Собственно строю дерево категорий функцией:

    function GetSections($TYP_ID, $PARENT, $LNG_ID){
        $SQL=tep_db_query('SELECT
                STR_ID, TEX_TEXT AS STR_DES_TEXT, STR_ID_PARENT, STR_LEVEL, STR_SORT, STR_NODE_NR, 
                IF(EXISTS(SELECT * FROM SEARCH_TREE AS SEARCH_TREE2 WHERE SEARCH_TREE2.STR_ID_PARENT <=> SEARCH_TREE.STR_ID LIMIT 1), 1, 0) AS DESCENDANTS
            FROM SEARCH_TREE
                INNER JOIN DESIGNATIONS ON DES_ID = STR_DES_ID
                INNER JOIN DES_TEXTS ON TEX_ID = DES_TEX_ID
            WHERE
                STR_ID_PARENT <=> '.$PARENT.' AND
                DES_LNG_ID = '.$LNG_ID.' AND
                EXISTS (
                    SELECT * FROM LINK_GA_STR
                        INNER JOIN LINK_LA_TYP ON LAT_TYP_ID ='.$TYP_ID.' AND LAT_GA_ID = LGS_GA_ID
                        INNER JOIN LINK_ART ON LA_ID = LAT_LA_ID
                    WHERE
                        LGS_STR_ID = STR_ID
                    LIMIT 1)
            ORDER BY STR_DES_TEXT');
        $result .= '<ul>';
        while($arPRes = tep_db_fetch_array($SQL)){ 
            $result .= '<li>' . $arPRes['STR_DES_TEXT'];
            if($arPRes['DESCENDANTS'] > 0) {
                $result .= GetSections($TYP_ID, $arPRes['STR_ID'], $LNG_ID);
            }
            $result .= '</li>';
        }       
        $result .= '</ul>';
        return $result;
    }

Это единственный выход? Есть варианты пооптимистичнее 134 запросов в базу на 9 секунд?

Всего 4 уровня:

На _exist.ua/cat/TecDoc/Cars/Audi/258/69300003 намного быстрее строит полное дерево.

SELECT
       SEARCH_TREE.STR_LEVEL,
       ELT(SEARCH_TREE.STR_LEVEL, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT,
       ELT(SEARCH_TREE.STR_LEVEL, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID,
       SEARCH_TREE.STR_ID_PARENT AS STR_PARENT,
       ELT(SEARCH_TREE.STR_LEVEL-1, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT2,
       ELT(SEARCH_TREE.STR_LEVEL-1, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID2,
       ELT(SEARCH_TREE.STR_LEVEL-2, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT3,
       ELT(SEARCH_TREE.STR_LEVEL-2, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID3,
       ELT(SEARCH_TREE.STR_LEVEL-3, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT4,
       ELT(SEARCH_TREE.STR_LEVEL-3, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID4,
       ELT(SEARCH_TREE.STR_LEVEL-4, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT5,
       ELT(SEARCH_TREE.STR_LEVEL-4, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID5
        FROM
                  SEARCH_TREE
        LEFT JOIN DESIGNATIONS ON DESIGNATIONS.DES_ID = SEARCH_TREE.STR_DES_ID AND DESIGNATIONS.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS ON DES_TEXTS.TEX_ID = DESIGNATIONS.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE2 ON SEARCH_TREE2.STR_ID = SEARCH_TREE.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS2 ON DESIGNATIONS2.DES_ID = SEARCH_TREE2.STR_DES_ID AND DESIGNATIONS2.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS2 ON DES_TEXTS2.TEX_ID = DESIGNATIONS2.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE3 ON SEARCH_TREE3.STR_ID = SEARCH_TREE2.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS3 ON DESIGNATIONS3.DES_ID = SEARCH_TREE3.STR_DES_ID AND DESIGNATIONS3.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS3 ON DES_TEXTS3.TEX_ID = DESIGNATIONS3.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE4 ON SEARCH_TREE4.STR_ID = SEARCH_TREE3.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS4 ON DESIGNATIONS4.DES_ID = SEARCH_TREE4.STR_DES_ID AND DESIGNATIONS4.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS4 ON DES_TEXTS4.TEX_ID = DESIGNATIONS4.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE5 ON SEARCH_TREE5.STR_ID = SEARCH_TREE4.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS5 ON DESIGNATIONS5.DES_ID = SEARCH_TREE5.STR_DES_ID AND DESIGNATIONS5.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS5 ON DES_TEXTS5.TEX_ID = DESIGNATIONS5.DES_TEX_ID

Вот запрос для вывода полного списка категорий в базе, но как их связать с нужным мне $TYP_ID?

Пробовал запрос:

SELECT
       SEARCH_TREE.STR_LEVEL,
       ELT(SEARCH_TREE.STR_LEVEL, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT,
       ELT(SEARCH_TREE.STR_LEVEL, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID,
       SEARCH_TREE.STR_ID_PARENT AS STR_PARENT,
       ELT(SEARCH_TREE.STR_LEVEL-1, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT2,
       ELT(SEARCH_TREE.STR_LEVEL-1, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID2,
       ELT(SEARCH_TREE.STR_LEVEL-2, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT3,
       ELT(SEARCH_TREE.STR_LEVEL-2, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID3,
       ELT(SEARCH_TREE.STR_LEVEL-3, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT4,
       ELT(SEARCH_TREE.STR_LEVEL-3, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID4,
       ELT(SEARCH_TREE.STR_LEVEL-4, DES_TEXTS.TEX_TEXT, DES_TEXTS2.TEX_TEXT, DES_TEXTS3.TEX_TEXT, DES_TEXTS4.TEX_TEXT, DES_TEXTS5.TEX_TEXT) AS STR_TEXT5,
       ELT(SEARCH_TREE.STR_LEVEL-4, SEARCH_TREE.STR_ID, SEARCH_TREE2.STR_ID, SEARCH_TREE3.STR_ID, SEARCH_TREE4.STR_ID, SEARCH_TREE5.STR_ID) AS STR_ID5
        FROM
                  SEARCH_TREE
        LEFT JOIN DESIGNATIONS ON DESIGNATIONS.DES_ID = SEARCH_TREE.STR_DES_ID AND DESIGNATIONS.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS ON DES_TEXTS.TEX_ID = DESIGNATIONS.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE2 ON SEARCH_TREE2.STR_ID = SEARCH_TREE.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS2 ON DESIGNATIONS2.DES_ID = SEARCH_TREE2.STR_DES_ID AND DESIGNATIONS2.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS2 ON DES_TEXTS2.TEX_ID = DESIGNATIONS2.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE3 ON SEARCH_TREE3.STR_ID = SEARCH_TREE2.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS3 ON DESIGNATIONS3.DES_ID = SEARCH_TREE3.STR_DES_ID AND DESIGNATIONS3.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS3 ON DES_TEXTS3.TEX_ID = DESIGNATIONS3.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE4 ON SEARCH_TREE4.STR_ID = SEARCH_TREE3.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS4 ON DESIGNATIONS4.DES_ID = SEARCH_TREE4.STR_DES_ID AND DESIGNATIONS4.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS4 ON DES_TEXTS4.TEX_ID = DESIGNATIONS4.DES_TEX_ID
        LEFT JOIN SEARCH_TREE AS SEARCH_TREE5 ON SEARCH_TREE5.STR_ID = SEARCH_TREE4.STR_ID_PARENT
        LEFT JOIN DESIGNATIONS AS DESIGNATIONS5 ON DESIGNATIONS5.DES_ID = SEARCH_TREE5.STR_DES_ID AND DESIGNATIONS5.DES_LNG_ID = '.$LNG_ID.'
        LEFT JOIN DES_TEXTS AS DES_TEXTS5 ON DES_TEXTS5.TEX_ID = DESIGNATIONS5.DES_TEX_ID
        WHERE
                    EXISTS (
                    SELECT * FROM LINK_GA_STR
                        INNER JOIN LINK_LA_TYP ON LAT_TYP_ID ='.$TYP_ID.' AND LAT_GA_ID = LGS_GA_ID
                        INNER JOIN LINK_ART ON LA_ID = LAT_LA_ID
                    WHERE
                        LGS_STR_ID = STR_ID
                    LIMIT 1)

Вроде отсортировала, но все равно были категории которых быть не должно в сравнении с запросом из первого поста