Very short trick: duplicate or clone one or more rows in MySQL

To duplicate the contents of a table full of itself, just use:

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* FROM MYTABLE INSERT INTO SELECT * FROM MyTable MYTABLE

You can also use the Claus WHERE if necessary:

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* FROM MYTABLE WHERE a = b INSERT INTO SELECT * FROM MyTable WHERE MYTABLE a = b

If the table has any index or unique key, which would cause an error, you can filter the fields to be duplicated:

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field1 , field2 , ... ) SELECT field1 , field2 , ... FROM MYTABLE INSERT INTO MYTABLE (field1, field2, ...) SELECT field1, field2, ... FROM MyTable

Even you can duplicate a record and change a value, such as dual field and add 1:

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field1 , field2 , ... ) SELECT ( field1 + 1 ) , field2 , ... FROM MYTABLE INSERT INTO MYTABLE (field1, field2, ...) SELECT (field1 + 1), field2, ... FROM MyTable

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