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Computer science · University

Joins and relationships

An operation combining rows according to a relationship condition.

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Prerequisites

Basic computing and simple data tables.

Study notes

Join

An operation combining rows according to a relationship condition.

One-to-many

A relationship where one row can correspond to several rows in another table.

Inner join

A join returning rows with matches under the join condition.

Left join

A join retaining all rows from the left side plus matching right-side rows.

Worked examples

Which term best matches this description: An operation combining rows according to a relationship condition.

Join is the matching concept in this lesson.

Join

Which term best matches this description: A relationship where one row can correspond to several rows in another table.

One-to-many is the matching concept in this lesson.

One-to-many

Check your understanding

  1. Which concept would you apply first in a situation where a join returning rows with matches under the join condition.

    1. Left join
    2. Inner join
    3. One-to-many
    4. Join

  2. Name the concept described as: A join retaining all rows from the left side plus matching right-side rows.

  3. Which statement about Join is most accurate?

    1. An operation combining rows according to a relationship condition.
    2. A join retaining all rows from the left side plus matching right-side rows.
    3. A join returning rows with matches under the join condition.
    4. A relationship where one row can correspond to several rows in another table.

  4. Explain one important difference between Join and One-to-many.

Answers and marking guidance

Answers and marking notes
  1. Inner join

    The scenario directly calls for Inner join.

  2. Left join

    The intended concept is Left join.

  3. An operation combining rows according to a relationship condition.

    The definition in the lesson notes gives the required condition.

  4. Join: An operation combining rows according to a relationship condition. One-to-many: A relationship where one row can correspond to several rows in another table.

    Credit a clear distinction using both definitions and an appropriate example if supplied.

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