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Questions and Answers
What is a SQL JOIN clause used for?
What is a SQL JOIN clause used for?
- To combine rows from two or more tables based on a related column between them (correct)
- To update rows from two or more tables based on a related column between them
- To delete rows from two or more tables based on a related column between them
- To insert rows into two or more tables based on a related column between them
What is the relationship between the 'CustomerID' columns in the 'Orders' and 'Customers' tables?
What is the relationship between the 'CustomerID' columns in the 'Orders' and 'Customers' tables?
- The 'CustomerID' column in the 'Orders' table refers to the 'CustomerID' in the 'Customers' table (correct)
- The 'CustomerID' column in the 'Orders' table and the 'CustomerID' column in the 'Customers' table are unrelated
- The 'CustomerID' column in the 'Customers' table refers to the 'CustomerID' in the 'Orders' table
- The 'CustomerID' column in the 'Orders' table and the 'CustomerID' column in the 'Customers' table are the same column
What does a SQL inner join do?
What does a SQL inner join do?
- Excludes rows from the tables where the join conditions are satisfied
- Returns all rows from both tables
- Returns only the rows from the first table
- Includes rows from the tables where the join conditions are satisfied (correct)
