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LINQ with Select, OrderBy and Take
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LINQ with Select, OrderBy and Take

EasySQL · PostgreSQL

Problem

Solve a typical LINQ problem using Select, OrderBy and Limit.

Asked in the HackerRank coding challenge (75 minutes) stage. This was the second problem in the 75-minute HackerRank screen and was rated easy.

Use the provided users and user_profiles tables. Return users even when no matching profile exists.

Output

  1. One row per user, limited to the five newest users.
  2. Columns: user_id, user_name, city, and created_at.
  3. Order by created_at descending, then user_id ascending to break ties.

Schema

users
ColumnTypeDescription
user_idPKINTUnique user identifier
user_nameVARCHAR(100)User display name
created_atDATEDate the user was created
user_profiles
ColumnTypeDescription
profile_idPKINTUnique profile identifier
user_idINTReferenced user identifier
cityVARCHAR(80)User city
Tablesusersuser_profiles
Interviewer

Your question is LINQ with Select, OrderBy and Take. Start with the requirements and the two tables in the Question tab.

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