Question
Jump to level 1 What type of join is the query? Select all that apply. SELECT Song1. Title, Song2. Title FROM Song As Song1, Song As Song2 WHERE Song1. Length > Song2. Length Equijoin Non-equijoin Self-join Cross-join Check How was this section?
Ask by Bowman Horton. in the United States
Jan 22,2025
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Tutor-Verified Answer
Answer
The query is a **non-equijoin** and a **self-join**.
Solution
The query provided involves the following types of joins:
1. **Non-equijoin**
- **Explanation:** A non-equijoin occurs when the join condition uses operators other than equality (e.g., `<`, `>`, `!=`). In your query, the condition `Song1.Length > Song2.Length` uses the greater than (`>`) operator, making it a non-equijoin.
2. **Self-join**
- **Explanation:** A self-join is when a table is joined to itself. In the query, the `Song` table is referenced twice with different aliases (`Song1` and `Song2`), indicating that it's a self-join.
### Summary:
- **Non-equijoin:** ✔️
- **Self-join:** ✔️
- **Equijoin:** ❌ (since the join condition is not based on equality)
- **Cross-join:** ❌ (a cross join produces a Cartesian product without a specific join condition)
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Simplify this solution Mind Expander
This query showcases a self-join, as it involves the same table (Song) being joined with itself. The condition in the WHERE clause requires that one song's length is greater than another's, effectively creating a comparison across the same dataset. Additionally, since the query does not employ an equality condition in the join (but rather a greater than), it also qualifies as a non-equijoin. So, while it generates results based on comparisons between two instances of the same table, it avoids the straightforward equality often seen in joins.
