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4 cards from this section. Quick, good the night before a test.
What SQL command is used to retrieve data?
Think about what command helps you see data.
What does the WHERE clause do?
It narrows down the selection of data.
What command would you use to retrieve records from a SQL database?
This is the first step to getting information from a database.
True or False: The WHERE clause can filter records based on specified conditions.
Think about how you narrow down results in a query.
You need to ensure that all users with the same email in the database are unique. Write an SQL query to find duplicates based on email.
You are looking to count entries grouped by email.
Write a test case scenario using SQL to validate that the total amount in orders matches the sum of items for multiple orders.
Think about how you can aggregate item prices grouped by orders.
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