Additional Notes
How would you explain a LEFT JOIN, and when should you use it in an interview?
Track: Java
Topic: SQL for Java Devs
Focus: JOINs
Java: JOINs
Answer
A LEFT JOIN returns all rows from the left table and matched rows from the right table.
LEFT JOIN is useful when you want all records from the left table regardless of whether there is a match in the right table. This is often used to find records that may not have a corresponding entry in another table, such as listing all products regardless of whether they have any reviews.
LEFT JOIN is useful when you want all records from the left table regardless of whether there is a match in the right table. This is often used to find records that may not have a corresponding entry in another table, such as listing all products regardless of whether they have any reviews.
Topics: Java JOINs SQL for Java Devs