Question

Perform MySQL LEFT JOIN on two tables?

Answer 1

You can also try:

INSERT IGNORE

INTO table_1

SELECT *

FROM table_2

;

which allows those rows in table_1 to supersede those in table_2 that have a matching primary key, while still inserting rows with new primary keys.

Alternatively,

REPLACE

INTO table_1

SELECT *

FROM table_2

;

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