On duplicate key update example

2020-02-23 18:55 There is a MySQL specific extension to SQL that may be what you want REPLACE INTO However it does not work quite the same as 'ON DUPLICATE UPDATE' It deletes the old row that clashes with the new row and then inserts the new row.

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. Lets take a look at an example of using the INSERT ON DUPLICATE KEY UPDATE to understand how it works. on duplicate key update example

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, MySQL performs an UPDATE of the old row. For example, if column a is declared as UNIQUE and contains the value 1,

See the example above where otherfield1 is set to insertvalue on INSERT or to updatevalue on UPDATE while otherfield2 is always set to othervalue. Crucial for the Insert on Duplicate Key Update (IODKU) to work is the schema containing a unique key that will signal a duplicate clash. This unique key can be a Primary Key or not. on duplicate key update example

Nov 22, 2013 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 articleid 12 and viewscount 1 (not 2). Batch insert with ON DUPLICATE KEY. There is also option to make batch insert to database using ON DUPLICATE KEY UPDATE. Mar 16, 2012 GROUPCONCAT and ON DUPLICATE KEY UPDATE: Two examples of mySQL's less commonly used functions, yet ridiculously powerful functions. These functions can make your relational database quick and painless once you understand the theory behind them. on duplicate key update example

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