The statement above sets the value of the c1 to its current value specified by the expression values(c1) plus 1 if there is a duplicate in unique index or primary key. mysql insert on duplicate key update example. let’s take a look at an example of using the insert on duplicate key update to understand how it works.. The on duplicate key update clause can contain multiple column assignments, separated by commas. in assignment value expressions in the on duplicate key update clause, you can use the values(col_name) function to refer to column values from the insert portion of the insert on duplicate key update statement.. On duplicate key update inserts or updates a row, the last_insert_id() function returns the auto_increment value. the on mysql tutorial mysql and windows. user comments. user comments in this section are, as the name implies, provided by mysql users..
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.. Also, although unnecessary for the on duplicate key update method to function properly, we’ve also opted to utilize user variables so we don’t need to specify the actual values we want to insert or update more than once.. If you specify on duplicate key update, and a row is inserted that would cause a duplicate value in a unique index or primary key, an update of the old row occurs. 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..
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