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3 sty 2022 · A lot of developers still execute a query to check if a field is present in a table and then execute an insert or update query according to the result of the first query. Try using the ON DUPLICATE KEY syntax, this is a lot faster and better then executing 2 queries.
27 sty 2024 · MySQL offers the INSERT ON DUPLICATE KEY UPDATE clause, which is the closest to a standard UPSERT statement. It works by attempting to insert a new row. If the insertion would result in a duplicate entry for a PRIMARY KEY or a UNIQUE index, MySQL updates the existing row instead. INSERT INTO table_name (column1, column2, ...)
13 paź 2022 · I want to insert into the table with a pair of (id, serial), if neither of id or serial appears in the table. So, I think I might do this: UPDATE device SET updated='<current-time>' WHERE id='<device_id>' OR. serial='<serial_no>' ON UPDATE FAIL INSERT (id,serial,...) VALUES (...)
29 kwi 2015 · In aforementioned table, reg_id (INT) is a column whose values can be changed for a machine_id. I would like to define a QUERY / PROCEDURE to check if a reg_id already exists in that table. If it does, then UPDATE that row, otherwise INSERT a new row.
Learn to insert rows in MySQL only if they don't exist. Explore techniques like INSERT IGNORE, REPLACE, and ON DUPLICATE KEY UPDATE. Dive into the guide!
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.
17 lis 2010 · I want to add a row to a database table, but if a row exists with the same unique key I want to update the row. For example: INSERT INTO table_name (ID, NAME, AGE) VALUES(1, "A", 19); Let’s say the unique key is ID, and in my Database, there is a row with ID = 1.
