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The ON DUPLICATE KEY UPDATE statement in MySQL is used when you want to either insert a new row into a table or update the existing row if a duplicate key constraint is violated. In other words, it allows you to handle duplicates gracefully.
Here’s an example to illustrate its usage:
INSERT INTO your_table (column1, column2, column3)
VALUES (value1, value2, value3)
ON DUPLICATE KEY UPDATE
column1 = value1_updated,
column2 = value2_updated,
column3 = value3_updated;
In the above example, if there is a duplicate key error when inserting the values into your_table, instead of failing with an error, the specified columns (column1, column2, column3) will be updated with the corresponding new values (value1_updated, value2_updated, value3_updated).
It’s important to note that for ON DUPLICATE KEY UPDATE to work, you need to have a unique key or primary key constraint defined on the table. Duplicate key errors are typically generated when you try to insert a row with a key value that already exists in the table.
Using ON DUPLICATE KEY UPDATE can be helpful in scenarios where you need to handle non-unique data gracefully and manage conflicts efficiently.
// End written by AI ChatGPT
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