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Inner Join vs Left Join
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Inner Join vs Left Join

EasySQL · PostgreSQL

Problem

What is the difference between an inner join and a left join?

Write a PostgreSQL query using the provided users and assignments tables to demonstrate the difference by returning every user, including users without an assignment. Include matched assignment details when available and label each result as assigned or unassigned.

Output

  1. One row per assignment for matched users, plus one row for each user without an assignment.
  2. Return user_id, user_name, assignment_id, project_name, and assignment_status.
  3. Sort by user_id, then assignment_id, with unassigned users after assigned rows.

Schema

users
ColumnTypeDescription
user_idPKINTUnique user identifier
user_nameVARCHAR(100)User display name
team_nameVARCHAR(100)User team name
assignments
ColumnTypeDescription
assignment_idPKINTUnique assignment identifier
user_idINTUser assigned to the project
project_nameVARCHAR(120)Assigned project name
assignment_roleVARCHAR(80)Role on the assignment
Tablesusersassignments
Interviewer

Your question is Inner Join vs Left Join. Start with the requirements and the two tables in the Question tab.

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CodePostgreSQL
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