SQL內連接刪除

tests_sub，tests_sub_sub

和tests_sub.id = tests_sub_sub.id

，所以我想用一個

SQL刪除兩個表中的數據查詢

我用下面的內連接

DELETE tests_sub, tests_sub_sub FROM tests_sub 
INNER JOIN tests_sub_sub ON tests_sub_sub.id = tests_sub.id 
WHERE tests_sub.id = 10

查詢工作正常只有當兩個表具有項爲tests_sub.id ... （如果tests_sub_sub有test_sub.id = 10沒有進入...雖然表tests_sub有條目爲該ID沒有行受到影響... 請建議一些提示....

來源

2013-10-15 sx3

請參考此鏈接使用連接刪除 http://stackoverflow.com/questions/652770/delete-with-join-in-mysql – Deepak

使用LEFT JOIN我認爲解決您的問題 –

內連接只產生表A和表B中匹配的記錄集。嘗試使用'Left Outer Join' – heretolearn

使用LEFT JOIN。

DELETE tests_sub, tests_sub_sub 
FROM tests_sub 
     LEFT JOIN tests_sub_sub 
      ON tests_sub_sub.id = tests_sub.id 
WHERE tests_sub.id = 10

來源

2013-10-15 07:12:53

感謝兄弟....但如何有3個表??? ........ .............. DELETE tests，tests_sub FROM tests LEFT JOIN tests_sub ON tests_sub.idtests = tests.idtests LEFT JOIN tests_sub_sub ON tests_sub_sub.idtests_sub = tests_sub.idtests_sub WHERE tests.idtests = 10 – sx3

t加上'DELETE a，b，c FROM LEFT JOIN b ON .... LEFT JOIN c on .... WHERE ....' - 如果你想刪除3個表格。 –

好的兄弟我明白了..它工作正常..謝謝。 – sx3

SQL內連接刪除

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