Imagine you have a database with a table named 'Contacts'. You've been asked to update a user's phone number. Which of the following is the BEST way to approach this task while ensuring accuracy and minimizing the impact on other data?
You selected this option
Locate the record by the user's unique ID, typically the primary key, and use an update statement to change the phone number.
You selected this option
Perform an update operation without specifying any conditions.
You selected this option
Update the phone number field for all records in the 'Contacts' table.
You selected this option
Use the user's first name to find the correct record and update the phone number.
The correct answer is to locate the specific record using a unique identifier such as the primary key and then perform the update operation. This ensures that only the intended record is modified and prevents unintentional changes to other records. Using a non-unique field, like a first name, could inadvertently update multiple records if more than one person shares the same name. Updating without a condition or updating the entire table would apply changes to all records, which is not the desired outcome.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What is a primary key and why is it important in a database?
Open an interactive chat with Bash
What is the purpose of an update statement in SQL?
Open an interactive chat with Bash
What could go wrong if I use a non-unique field like first name to update records?