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WHERE Clause
In order to keep learning about CRUD operations in SQL, we need to learn how to make the instructions we send to the database more specific. SQL accepts a WHERE statement within a query that allows us to be very specific with our instructions.
If we were unable to specify the record we wanted to READ, UPDATE, or DELETE making queries to a database would be very frustrating, and very inefficient.
Using a WHERE Clause
Say we had over 9000 records in our users table. We often want to look at specific user data within that table without retrieving all the other records in the table. We can use a SELECT statement followed by a WHERE clause to specify which records to retrieve. The SELECT statement stays the same, we just add the WHERE clause to the end of the SELECT. Here's an example:
SELECT name FROM users WHERE power_level >= 9000;
This will select only the name field of any user within the users table WHERE the power_level field is greater than or equal to 9000.
Assignment
We need to know the username of all the users in our users table that have admin privileges! Retrieve them.
Check the up migration file (001_up.sql) to see which fields exist.