Tour start here for a quick overview of the site help center detailed answers to any questions you might have meta discuss the workings and policies of this site. 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.. 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..
On duplicate key update". with the "on duplicate key update", when there is a duplicate key in mysql exists, the respective records will be updated (so to avoid inserting the data twice). i cannot remove the duplicated rows in mysql as it contains extra fields with user-input value.. The problem is when i execute this query, i want to check whether a unique key (which is not the primary key), for eg. ‘name’ in above case, should be checked and if such a ‘name’ already exists, the corresponding whole row should be updated otherwise inserted.. Stack exchange network consists of 174 q&a communities including stack overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. visit stack exchange.
