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並前往https://www.wyzant.com/resources/answers/637161/how-do-i-update-if-exists-insert-if-not-aka-upsert-or-merge-in-mysql

How do I update if exists, insert if not (AKA "upsert" or "merge ...

I use MySql almost exclusively, and for that system the query would look like this: Insert into tablename(col1, col2, col3) values(val1,val2 ...

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