Database Security
SQL query to return names of users who are both administrators and moderators
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This technical problem asks the reader to write a SQL query that will return the names of all users who are both administrators and moderators. The input is a table of users and their roles. The output should be the names of the users who are both administrators and moderators.
Users Who Have Logged In from Multiple IP Addresses
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This technical problem involves writing a SQL query to find all user IDs that have logged in from more than one IP address.
Find Username from User ID and Password
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Given a table with user_id, username, and password columns, and a list of user_id and password pairs, write a query to find the username for each user_id in the list.
SQL Query to Find Most Common First Name
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To find the most common first name in a table of user data, write a SQL query that groups the data by first name and orders the results by the number of occurrences.
Sort table by id column in ascending order
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The table has two columns, id and data. The query should return the data in ascending order of id.
SQL Query to Find Users with a Valid Email Address
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This problem asks for a SQL query to find all users in a table who have a valid email address.
