I'm using MySQL, and I need to know how to create a primary key for a table that contains more than one attribute.
For example, I would want both the last_name and first_name attributes to be a singular primary key.
MySQL supports multi-column primary keys just like other popular database management systems. If you haven't originally defined the table with a primary key, you can ALTER the table with syntax similar to the following:
alter table MyTable add primary key (Last_Name, First_Name);
For More Information
- What do you think about this answer? E-mail the edtiors at editor@searchDatabase.com with your feedback.
- The Best SQL Web Links: tips, tutorials, scripts, and more.
- Have an SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.
Dig deeper on Oracle and SQL
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.