/* Oops! We forgot to add the university_shortname column to the professors table. You've probably already noticed: In chapter 4 of this course, you'll need this ...
* [`ADD`](/sql-statements/sql-statement-add-index.md)，[`DROP`](/sql-statements/sql-statement-drop-index.md)，或 [`RENAME`](/sql-statements/sql-statement-rename ...
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