🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

New No-Code Track! 🚀 New videos dropping every week—start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Community Projects
    • Live Sessions
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Community Projects Live Sessions Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
  • Daniel Sibanda
    Daniel Sibanda
    4,803 Points

    Select the first letter of the "first_name", add a period after it, followed by a space and add the "last_name". Also, c

    Posted August 6, 2015 11:05am by Daniel Sibanda
    Daniel Sibanda
    4,803 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    2 Answers

  • Daniel Sibanda
    Daniel Sibanda
    4,803 Points

    Select the "first_name" followed by the username in parentheses and alias it as "display_name". For example "Andrew (cha

    Posted August 6, 2015 9:54am by Daniel Sibanda
    Daniel Sibanda
    4,803 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • Junichi Shibatani
    Junichi Shibatani
    651 Points

    CONCAT question

    Posted July 27, 2015 8:38pm by Junichi Shibatani
    Junichi Shibatani
    651 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • JoAnna Howell
    JoAnna Howell
    7,191 Points

    Unknown column 'first_name' in 'field list'

    Posted July 18, 2015 11:29pm by JoAnna Howell
    JoAnna Howell
    7,191 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • Paul Mefford
    Paul Mefford
    2,966 Points

    Last Challenge Question

    Posted June 27, 2015 6:50pm by Paul Mefford
    Paul Mefford
    2,966 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • MUZ140264 Tsitsi Mupamombe
    MUZ140264 Tsitsi Mupamombe
    4,195 Points

    TROUBLE ON CHALLENGE 3

    Posted June 25, 2015 12:31pm by MUZ140264 Tsitsi Mupamombe
    MUZ140264 Tsitsi Mupamombe
    4,195 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • MUZ140610 Tinashe Marunda
    MUZ140610 Tinashe Marunda
    7,028 Points

    Select the "first_name" followed by the username in parentheses and alias it as "display_name". For example "Andrew (cha

    Posted June 18, 2015 2:38am by MUZ140610 Tinashe Marunda
    MUZ140610 Tinashe Marunda
    7,028 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    0 Answers

  • Samuel Sanders
    Samuel Sanders
    6,992 Points

    Why are these not working for Challenge #2

    Posted June 4, 2015 8:08pm by Samuel Sanders
    Samuel Sanders
    6,992 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • Juliette Tworsey
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Juliette Tworsey
    Front End Web Development Techdegree Graduate 32,625 Points

    Select the first letter of the "first_name", add a period after it, followed by a space and add the "last_name".

    Posted May 29, 2015 7:18pm by Juliette Tworsey
    .a{fill-rule:evenodd;}techdegree seal-36
    Juliette Tworsey
    Front End Web Development Techdegree Graduate 32,625 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    0 Answers

  • Becca Ades
    Becca Ades
    4,205 Points

    Don't understand why my code isn't working: SELECT CONCAT(first_name," ",(username)) AS display_name FROM users;

    Posted May 22, 2015 10:27pm by Becca Ades
    Becca Ades
    4,205 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points

    Help with this query please.

    Posted May 18, 2015 10:40pm by Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    0 Answers

  • Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points

    Could anyone help me with this Mysql query? I am using the Concat function.

    Posted May 17, 2015 5:40pm by Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    0 Answers

  • Andrew VanVoorhis
    Andrew VanVoorhis
    7,760 Points

    String Functions Challenge Task 2

    Posted May 17, 2015 6:57am by Andrew VanVoorhis
    Andrew VanVoorhis
    7,760 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    1 Answer

  • Daniele Vicinanzo
    Daniele Vicinanzo
    21,277 Points

    Challenge Task 1 of 3 In the "users" table, lowercase the "email" column and alias it as "lower_email".

    Posted May 16, 2015 12:30pm by Daniele Vicinanzo
    Daniele Vicinanzo
    21,277 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    2 Answers

  • Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points

    What am I doing wrong in this Concat query? Thanks

    Posted May 15, 2015 7:08pm by Pedro nieto Sanchez
    Pedro nieto Sanchez
    28,169 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    0 Answers

  • Matthew Fenton
    Matthew Fenton
    6,331 Points

    objective 2 of 3 in database foundations.

    Posted May 5, 2015 11:17pm by Matthew Fenton
    Matthew Fenton
    6,331 Points
    • Development Tools
    • Database Foundations
    • SQL Calculating, Aggregating and Other Functions
    • String Functions

    2 Answers

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

    Treehouse

  • About
  • Blog
  • Careers
  • Community
  • Stories
  • Shop
  • Contact
  • Gift Card

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.