[英]How do I delete a foreign key that does not exist from a table that does not exist, in MySQL?
我試圖重命名InnoDB表中的主鍵，但我一直得到Errno150。SHOW INNODB STATUS顯示：
LATEST FOREIGN KEY ERROR
130711 18:22:53 Error in foreign key constraint of table xx/client_location_business_load:
there is no index in referenced table which would contain
the columns as the first columns, or the data types in the
referenced table do not match the ones in table. Constraint:
,
CONSTRAINT "business_load_business_load_name_key" FOREIGN KEY ("name_id") REFERENCES "client_businesstype_load_name" ("name_id") ON DELETE CASCADE ON UPDATE CASCADE
表client_location_business_load甚至不存在！ 它被重命名。 名為business_load_business_load_name_key的約束也不存在，已被刪除並且它也沒有出現在information_schema.key_column_usage 。
有人知道這里發生了什么嗎？
您必須刪除數據庫並以相同的排序規則重新創建它。 似乎沒有其他選擇。
MYSQL僅當另一個表中不存在兩列的唯一鍵對時，才如何更新表？
[英]MYSQL How do I update a table only if a unique key pair of two columns does not exist in another table?
使用MySQL，如何在另一個表中不存在該值的情況下插入表中？
[英]With MySQL, how do I insert into a table on condition that the value does not exist in another table?
使用MySQL，如果在同一個表中不存在該值，我如何插入表中？
[英]With MySQL, how do I insert into a table on condition that the value does not exist in same table?
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