INSERT ON DUPLICATE KEY UPDATE
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In that case I want to update that row with these values. We have to have separate rows for each day. This statement activates INSERT and UPDATE triggers. 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.
Conditional ON DUPLICATE KEY UPDATE with IF Sometimes there might be need to make additional IF on update process. Code in commented section have some simple examples.
INSERT ON DUPLICATE KEY UPDATE - SELECT ON DUPLICATE KEY UPDATE statements are flagged as unsafe for statement-based replication...
Using INSERT IGNORE Using INSERT IGNORE effectively causes MySQL to ignore execution errors while attempting to perform INSERT statements. This means that an INSERT IGNORE statement which contains a duplicate value in a UNIQUE index or PRIMARY KEY field does not produce an error, but will instead simply ignore that particular INSERT command entirely. The obvious purpose is to execute a large number of INSERT statements for a combination of data that is both already existing in the database as well as new data coming into the system. Seuss' , 1960 ; Query OK , 0 rows affected 0. Seuss' , 1960 ; Query OK , 2 rows affected 0. More information on using REPLACE can be found in the. ON DUPLICATE KEY UPDATE The alternative and generally preferred method for INSERTING into rows that may contain duplicate UNIQUE or PRIMARY KEY values is to use the INSERT... ON DUPLICATE KEY UPDATE statement and clause. Unlike REPLACE — an inherently destructive command due to the DELETE commands it performs when necessary — using INSERT... ON DUPLICATE KEY UPDATE is non-destructive, in that it will only ever issue INSERT or UPDATE statements, but never DELETE.
With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not. We can't use our example as there is only creation date of the first insert. Because the results of statements depend on the ordering of rows from the and this order cannot always be guaranteed, it is possible when logging statements for the master and the slave to diverge. More information on using REPLACE can be found in the. The function is meaningful only in the ON DUPLICATE KEY UPDATE clause or statements and returns NULL otherwise. See also a similar statement. With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not. This issue is resolved in MySQL 5. If a duplicate error occurs, it will update the existing row with the value specified in the ON DUPLICATE KEY UPDATE clause.
