How to insert on duplicate in MySQL dump?
Sure, I can insert ON DUPLICATE in dump manually, but I want to automate merge process. –insert-ignore Insert rows with INSERT IGNORE. –replace Use REPLACE INTO instead of INSERT INTO. -t, –no-create-info Don’t write table creation info.
What happens if I import a file into MySQL?
Then import, but you might loose data, so perhaps create a backup table. All things considered, just don’t do this, check the alternatives listed below: But, since you are importing a file, the query will, most likely be a LOAD DATA [LOCAL] INFILE.
How to skip duplicate records when importing in…?
But, since you are importing a file, the query will, most likely be a LOAD DATA [LOCAL] INFILE. As you can see in the manual, you can easily add an IGNORE to that query, too: That’s it. Don’t worry if you’re not too comfortable writing your own queries like this, there are other ways of doing what you want to do:
How to on duplicate key update in MySQL?
If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: Press CTRL+C to copy.
When to use auto increment on duplicate key update?
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.
Is the use of values in MySQL deprecated?
The use of VALUES () to refer to the new row and columns is deprecated beginning with MySQL 8.0.20, and is subject to removal in a future version of MySQL. Instead, use row and column aliases, as described in the next few paragraphs of this section.