The on duplicate key update clause can contain multiple column assignments, separated by commas. with on duplicate key update, the affected-rows value per row is 1 if the row is inserted as a new row, and 2 if an existing row is updated.. Yes, "replace into" deletes before insert for duplicate rows, and it's slower than "update" but "on duplicate key update" is a much slower. i use "replace into" only for myisam tables, because in innodb it has side effects.. With on duplicate key update, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values..
I know that you can use on duplicate key update to update a certain value if there is a record for that key already,. i can do this: insert into `tablename` (`a`,`b`,`c`) values (1, 2, 3) on duplicate key update `a`=1, `b`=2, `c`=3 but how can i do this without having to write out the columns and values twice?. I know that you can insert multiple rows at once, is there a way to update multiple rows at once (as in, in one query) in mysql? edit: for example i have the following. On duplicate key update is a mariadb/mysql extension to the insert statement that, if it finds a duplicate unique or primary key, will instead perform an update. the row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the api's client_found_rows flag is set..
