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中存在價值我原本張貼的問題在這個線程:
mysql - display the values that exists in ALL the tables
內連接 - 檢查是否所有表
而且aleroot謝天謝地提出了一個解決方案。我試過了,一切似乎都奏效了。但是,我添加了更多的表格,出於某種原因它不再有效。
作爲測試,我在所有29個表中導入了相同的值。然而,當我運行下面的查詢時,它不會返回任何行。不知道我做錯了什麼。任何幫助將不勝感激。感謝
SELECT @rownum:=0;
SELECT name FROM userinformation ui WHERE EXISTS (
SELECT user_id FROM userinformation t1
INNER JOIN table1 USING(user_id)
INNER JOIN table2 USING(user_id)
INNER JOIN table3 USING(user_id)
INNER JOIN table4 USING(user_id)
INNER JOIN table5 USING(user_id)
INNER JOIN table6 USING(user_id)
INNER JOIN table7 USING(user_id)
INNER JOIN table8 USING(user_id)
INNER JOIN table9 USING(user_id)
INNER JOIN table10 USING(user_id)
INNER JOIN table11 USING(user_id)
INNER JOIN table12 USING(user_id)
INNER JOIN table13 USING(user_id)
INNER JOIN table14 USING(user_id)
INNER JOIN table15 USING(user_id)
INNER JOIN table16 USING(user_id)
INNER JOIN table17 USING(user_id)
INNER JOIN table18 USING(user_id)
INNER JOIN table19 USING(user_id)
INNER JOIN table20 USING(user_id)
INNER JOIN table21 USING(user_id)
INNER JOIN table22 USING(user_id)
INNER JOIN table23 USING(user_id)
INNER JOIN table24 USING(user_id)
INNER JOIN table25 USING(user_id)
INNER JOIN table26 USING(user_id)
INNER JOIN table27 USING(user_id)
INNER JOIN table28 USING(user_id)
INNER JOIN table29 USING(user_id)
WHERE t1.user_id = ui.user_id
);