How to restore dump without drop table before in MySql

Question

I have a dump of a part of a table from specific date and I would like to restore this dump in a replica database in the specific table, but when I try to restore it, the mysql gives me an error: The table is already exist .

In case it helps, the way I do the dump is the next:

mysqldump --user=root my_db my_table --where="YEAR(created)='2021' AND MONTH(created)='21'" > week21.sql

I know that I can create the dump with --opt option, but this option drop first the whole table, so I would lose the current data in this table right?

Any Idea to do that?

Thanks

Answer 1

mysqldump (or mariadb-dump ) emits a mess of SQL statements into its output file. You can read those statements by looking at the file in a text editor. And, you can edit the file if need be (but that's a brittle way to handle a workflow like yours).

You need to get it to write the correct SQL statements for your particular application. In your case the CREATE TABLE statements mess up your workflow, so leave them out.

If you use the command-line option --no-create-info mysqldump won't write CREATE TABLE statements into its output file. So that will solve your immediate problem.

If the rows you attempt to restore with your mysqldump output might already exist in your new table, you can use mysqldump's --insert-ignore command line option to get it to write INSERT IGNORE statements rather than plain INSERT statements.