SQL: Self-Joins


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question 1 of 3

Examine the following code: What would be the correct way to complete the FROM statement?

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1. A self-join can be used for what purpose?

2. Examine the following code. What is missing from the self-join statement?

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About This Quiz & Worksheet

Test your awareness of SQL self-joins. You'll need to answer questions on topics like completing a FROM statement and what self-joins are used for.

Quiz & Worksheet Goals

You'll also be quizzed on the following:

  • Something that is missing from a given self-join statement
  • The part of a self-join statement that leads to one record per criteria being returned
  • The comparison of data in a self-join query

Skills Practiced

  • Making connections - use understanding of the concept of a self-join query to recognize how it compares data
  • Information recall - access the knowledge you've gained regarding FROM statements
  • Interpreting information - verify that you can read information regarding the purpose of a self-join and interpret it correctly

Additional Learning

This subject can be explored further via the lesson entitled SQL: Self-Joins, which you can read or view at any time. It will help you to understand the following study points:

  • What an alias is, in this context
  • Examples of the application for a self-join
  • Running count in a self-join comparison