HelloSQL: Learn & Practice SQL
Educación
Gratis · Diseñado para iPad. No verificado para macOS.
SQL tends to make sense while you're reading about it, then fall apart the moment you try to write it yourself. HelloSQL is for the writing part.
You read a problem, write a query, and run it. The results show up as a table, and if they're right, it's marked correct right away. Grading looks at what your query returns, not how it's written, so your query doesn't have to match ours.
There are 120 exercises, and most of them look like everyday reporting tasks. For example: "List payments from largest to smallest. If two amounts are the same, put the older one first." The practice data is built around an online store's orders, employee attendance, and billing for a subscription service.
What's free and what isn't
The first 30 exercises are free, and you don't need an account. They cover SELECT, WHERE, ORDER BY, and LIMIT.
The other 90 move on to aggregate functions, GROUP BY, HAVING, INNER JOIN, LEFT JOIN, CASE, subqueries, CTEs, and window functions. You unlock all of them with one in-app purchase. There's no subscription and nothing recurring.
When you're stuck
Each exercise has three hints, and you open them one at a time. The first gives you only the idea. If that's not enough, the second shows the shape of the query, and the third tells you which tables and columns to use. We set it up this way so you don't have to jump straight to the answer.
There's also a sample solution with an explanation, and you can tap any underlined term in a problem to see what it means.
Coming back to it
Your drafts save automatically, so you can close the app halfway through a query and finish it later.
Missed exercises and bookmarks are kept together so you can try them again. Anything you get wrong comes back the next day. Exercises you get right come back too, after 3 days, then a week, then 3 weeks.
The editor suggests SQL keywords and column names as you type, and you can look at the tables and their data at any point. It works on iPhone and iPad, in light or dark mode.
If you've gone through a course or a book and want to actually use what you learned, this is a good next step. It also works as a warm-up before a SQL test or a technical interview.
Before you download
• The practice data is set in Japan, so some names, places, and text values are in Japanese. A few exercises ask you to type Japanese text into your query, such as WHERE city = '東京'. The exercise shows you the exact text to use.
• You can practice and check answers offline. You only need a connection to buy or restore the unlock.
• There are no ads.
Exercise 1 is a single line that pulls every customer's name. It's a good place to start.
Valoraciones y reseñas
- Esta app no ha recibido suficientes valoraciones o reseñas como para mostrar una visión general.
Added new features and improvements.
El desarrollador, Ryota Kumagawa, ha indicado que las prácticas de privacidad de la app pueden incluir la gestión de datos descrita a continuación. Para obtener más información, consulta la política de privacidad del desarrollador .
Datos vinculados contigo
Los siguientes datos pueden recopilarse y vincularse con tu identidad:
- Compras
- Ubicación
- Identificadores
- Datos de uso
Datos no vinculados contigo
Los siguientes datos pueden recopilarse, pero no se vinculan con tu identidad:
- Diagnósticos
Accesibilidad
El desarrollador no ha indicado todavía las prestaciones de accesibilidad que son compatibles con la app. Más información
Ficha técnica
- Tamaño
- 5,8 MB
- Categoría
- Educación
- Compatibilidad
Requiere iOS 17.0 o posterior.
- iPhone
Requiere iOS 17.0 o posterior. - iPad
Requiere iPadOS 17.0 o posterior. - Mac
Requiere macOS 14.0 o posterior y un Mac con el chip M1 de Apple o posterior. - Apple Vision
Requiere visionOS 1.0 o posterior.
- iPhone
- Idiomas
- Inglés, Japonés
- Edad
4+
- 4+
- Proveedor
Ryota Kumagawa
- Ryota Kumagawa no se ha identificado como comerciante de esta app. Si eres un consumidor que reside en el Espacio Económico Europeo, los derechos del consumidor no aplican a los acuerdos entre el proveedor y tú.
- Derechos de autor
- © 2026 RYOTA KUMAGAWA