我有这个问题让我有些头疼：
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,
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 = 21
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 = 21
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 = 21
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 = 21
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 = 21
LEFT JOIN DES_TEXTS AS DES_TEXTS5 ON DES_TEXTS5.TEX_ID = DESIGNATIONS5.DES_TEX_ID
ORDER BY STR_TEXT, STR_TEXT2, STR_TEXT3, STR_TEXT4, STR_TEXT5 LIMIT 1;
当我运行这个脚本时，phpmyadmin显示“正在加载”并且仍然被卡住了。
我该如何解决这个问题？
负责此问题可能是“ELT”功能吗？
请帮助......这对我来说完成一个项目非常重要。
祝你好运， 勒兹