Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I am considering creating a MySQL Data Base for a non-mission critical project. I was thinking about a scenario when, in case I had to insert another column in a table, how can I achieve that without compromising data integrity of the pre-existing columns as well as specify the default values of those additional columns? I’d like the answer for both SQL and Java Persistence API (JPA).
In addition, I’d also like to know how to add a table within a cell of a parent table.
The addition of a column should have no effect on pre-existing data, unless you do something that links the columns, such as creating a multi-column index, unique key, or something similar. But if there are no such linkages between the new & old columns, add as many columns as you like. Go crazy!