most important functions of any relational database management system (RDBMS)

One of the most important functions of any relational database management system (RDBMS) is to support your ability to manipulate data. To this end, you must be able to insert data in a table, modify that data, and then delete whatever data you no longer want to store. What are some of the MySQL commands that can be used to perform these tasks? Give an example of each command using an SQL statement and explain how each command works. What are some of the hazards of using MySQL commands to update and delete data? 

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