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並前往https://towardsdatascience.com/sql-insert-delete-and-update-in-one-statement-sync-your-tables-with-merge-14814215d32c

SQL — insert, delete and update in ONE statement: sync your ...

Think of the MERGE as a sort of JOIN; it compares the records of two tables. In stead of a LEFT, INNER and RIGHT join we can think of the MERGE as bein able ...

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