We build Web & Mobile Applications. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; 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. 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. We’ll discuss and see all these solutions in this post today. but this won't work when the MySQL database is at the back end of an active web site, with multiple interleaved queries happening all the time. ON DUPLICATE KEY UPDATE. However, it also contains some other statements to fulfill this objective, such as INSERT IGNORE or REPLACE. Using the MySQL INSERT on duplicate UPDATE query with PHP and PDO prepared statements ... November 7, 2019. : INSERT INTO t1 VALUES(1,2) ON DUPLICATE KEY UPDATE a=(SELECT a FROM t2 WHERE b=VALUES(b)); This does not do what the user expects. . Batch insert with ON DUPLICATE KEY. Other updates could sneak in between my separate SELECT / INSERT queries. We will learn and see all these solutions in detail. < All Articles. . In one of our larger Rails apps the sheer volume of data we process means we’ve had to rely more and more on direct SQL queries, denormalised tables and summary tables to speed things up. 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). Conditional duplicate key updates with MySQL. Using the MySQL INSERT on duplicate UPDATE query with PHP and PDO prepared statements. By default, MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this task. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . VALUES(b) will return NULL, even if it is in an INSERT .. ON DUPLICATE KEY UPDATE statement. E.g. insert into tablename set keyname = 'keyvalue', fieldname = 'fieldvalue' . However, there are other statements like INSERT IGNORE or REPLACE, which can also fulfill this objective. Also, the non-standard use in INSERT ... ON DUPLICATE KEY UPDATE does not extend to subqueries. Now, when using INSERT on DUPLICATE KEY UPDATE, we need to specify the criteria that the database needs to check in order to decide if it should update or insert. MySQL UPSERT with Examples. MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this behavior. It means that all code after ON DUPLICATE KEY UPDATE won't be executed. TheWebFellas. ; What you stated in the question is really all … ON DUPLICATE KEY UPDATE reports that a record was updated when the duplicate key occurs even if the record wasn't actually changed because the update values are the same as those in the record. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; We need a unique key, and MySQL allows us to specify multiple columns via a composite key… How it works : The statement first attempts to insert a new row into the table. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . PHP PDO INSERT on duplicate UPDATE. on duplicate key update updatecounter = updatecounter + 1 fieldname = 'fieldvalue' . There is also option to make batch insert to database using ON DUPLICATE KEY UPDATE. Along with the INSERT statement, ON DUPLICATE KEY UPDATE statement defines a list of column & value assignments in case of duplicate. . 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