I need a really good tutorial on how to alter MySQL databases, and to know how far you can alter a database without loosing or changing the information in the database. Thanx in advance for any help

From a philosophical point of view you cannot alter anything in a database without altering its information, because structure and data are what database information consists of. Even if you add only a column with no data or an enum value which is never used the semantics of the database will be changed by that action.
So better specify what your problem is and you might get a helpful answer.

You were very helpful, thank-you

Click Here

btw, ur subject says;

altering tables in MySQL

and your question says

I need a really good tutorial on how to alter MySQL databases

Which one is it?

Be a part of the DaniWeb community

We're a friendly, industry-focused community of 1.18 million developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge.