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I know that you can use ON DUPLICATE KEY UPDATE to update a certain value if there is a record for that key already, I can do this: INSERT INTO `tableName` (`a`,`b`,`c`) VALUES (1, 2, 3) ON DUPLICATE KEY UPDATE `a`=1, `b`=2, `c`=3
In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes. With ON DUPLICATE KEY UPDATE, 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.
In MySQL, the INSERT ON DUPLICATE KEY UPDATE statement allows you to insert new rows into a table. If a duplicate key violation occurs, you can use the INSERT ON DUPLICATE KEY UPDATE statement to update existing rows instead of throwing an error.
ON DUPLICATE KEY UPDATE inserts or updates a row, the LAST_INSERT_ID() function returns the AUTO_INCREMENT value. The ON DUPLICATE KEY UPDATE clause can contain multiple column assignments, separated by commas.
27 sty 2024 · The ON DUPLICATE KEY UPDATE clause in MySQL is a powerful tool for managing insert operations that would otherwise result in duplication. By leveraging the techniques discussed in this article, you can maintain data integrity and avoid redundancy with ease.
29 wrz 2024 · ON DUPLICATE KEY UPDATE can be useful for handling scenarios where you want to either insert a new row or update the existing one when conflicts arise. Syntax. The basic syntax goes like this: INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...) ON DUPLICATE KEY UPDATE column1 = value1, column2 = value2, ...;
16 kwi 2017 · VALUES (..), (..) ON DUPLICATE KEY UPDATE, which works to batch all of the values into one query, but executes excruciatingly slowly on large tables. I don't ever actually need to insert rows. Other approaches I've seen are to update using SET value = CASE WHEN...
