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Test Your SQL Joining Skills

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Questions and Answers

Which type of join returns all the rows from both tables being joined?

Inner Join

Left Join

Right Join

Full Outer Join (correct)

Which type of join returns NULL values for the right table columns if there are no matching rows in the right table?

Full Outer Join

Right Join

Inner Join

Left Join (correct)

Which type of join combines each row from the first table with every row from the second table?

Cross Join (correct)

Inner Join

Left Join

Right Join

Which type of join is used to create a temporary relationship between two instances of the same table?

<p>Self Join (C)</p> Signup and view all the answers

Which type of join returns only the rows that have matching values in both tables being joined?

<p>Inner Join (C)</p> Signup and view all the answers

Study Notes

Types of SQL Joins

Full Outer Join
- Returns all rows from both tables, including unmatched rows from either table.
- When there are no matches, NULL values are used for non-matching columns.
Right Outer Join
- Returns all rows from the right table, along with matching rows from the left table.
- If there is no match found in the left table, NULL values appear for the left table's columns.
Cross Join
- Combines each row from the first table with every row from the second.
- The resulting dataset is a Cartesian product, which can be very large if both tables have many rows.
Self Join
- Used to create a temporary relationship between two instances of the same table.
- Helps in comparing rows within the same table, like finding duplicates or hierarchical data.
Inner Join
- Returns only the rows with matching values in both tables.
- Excludes rows that do not have corresponding matches in either table, focusing only on the intersecting set of data.

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Description

"Master the Art of SQL Joins: Test Your Knowledge with this Quiz!" - Joining tables in SQL can be a tricky task for beginners, but with practice, it can become effortless. Take this quiz to test your knowledge of SQL joins and learn about different types of joins, including inner, outer, left, and right joins. Sharpen your SQL skills by mastering the art of data extraction from multiple tables using joins.