On Duplicate Key Update Primary

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 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.. On duplicate key update b = 2, c = 3; notice, the a = 1 is not included in the update part as it is the primary key and already found to be existing; therefore, you are updating the row where a is already 1..

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When updating summary tables we typically use on duplicate key update, a mysql extension to insert statements since version 4.1, that allows a record to either be inserted or updated in one query. for example, with this table:. It means that all code after on duplicate key update won't be executed. for instance in our example when we don't have such values in database, after this query we will have row with article_id = 12 and views_count = 1 (not 2). batch insert with on duplicate key. there is also option to make batch insert to database using on duplicate key update.. On duplicate key update syntax. if you specify an on duplicate key update clause and a row to be inserted would cause a duplicate value in a unique index or primary key, an update of the old row occurs. for example.

on duplicate key update primary

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