One of those maintenance tasks: copying data from one table to another.

You can copy all elements from a table into another like this:

INSERT INTO some_table 
SELECT * FROM other_table

Of course you can just select some if you want:

INSERT INTO some_table 
SELECT * FROM other_table WHERE list=94

If the table you’re copying to has existing data, you might have primary key duplication issues.

To leave the primary key column empty to make the table auto-fill it with its auto increment, I selected all columns except the primary key:

INSERT INTO some_table (`age`, `name`, `email`)
SELECT `age`, `name`, `email` FROM other_table

In my case id was the primary key column, and I left it out.