Question

I executing this statement:

CREATE TABLE test_mod SELECT * FROM `test` 

This copied a table into the newly created table. Then I executed this:

INSERT INTO test_mod(`test_name`) SELECT `test_name` FROM test

That statement should have inserted more data to the newly created table. It did so, but the primary key are all 0?!?!

The I executed this statement:

ALTER TABLE test_mod MODIFY test_id INT UNSIGNED NOT NULL AUTO_INCREMENT 

And phpmyadmin told me that the column test_id has already an auto_increment attribute.. so how can I populate more data while having an auto increment functionality?

Answer 1

Try

CREATE TABLE test_mod LIKE test;
INSERT INTO test_mod SELECT * FROM test;

This will copy the table definition from “test” and insert all data from it into “test_mod”.