Basic data types
Learn how to identify SQL data types (INTEGER, FLOAT, DECIMAL, VARCHAR, BOOLEAN), define table schemas, and select data types based on data characteristics.
Where it sits
This skill
Basic data types
Jobs that need it
- Backend Developer (ASP.NET Core)corelevel 3
- Backend Developer (Go)corelevel 3
- Backend Developer (Java, Spring Boot)corelevel 3
- Backend Developer (Node.js)corelevel 3
- Backend Developer (Python)corelevel 3
- Data Analystcorelevel 3
- Data Engineercorelevel 3
- Full Stack Developer (Java + React)corelevel 3
- Full Stack Developer (MEAN)corelevel 3
- Full Stack Developer (MERN)corelevel 3
- Full Stack Developer (Python + React)corelevel 3
- Data Scientistsupportinglevel 2
What level 3 (Working) means
Uses it independently on the job. Level 4 (Strong): handles hard cases, reviews others.
Basic data types: common questions
What is Basic data types?
Learn how to identify SQL data types (INTEGER, FLOAT, DECIMAL, VARCHAR, BOOLEAN), define table schemas, and select data types based on data characteristics.
Which jobs need Basic data types?
Backend Developer (ASP.NET Core), Backend Developer (Go), Backend Developer (Java, Spring Boot), Backend Developer (Node.js), Backend Developer (Python), and 7 more. Most ask for level 3 (Working): uses it independently on the job.
What should I learn before Basic data types?
Relational Data Model, SQL: structured query language.
How long does it take to learn Basic data types?
The starting lesson, Basic data types, takes about 9 minutes. Reaching the level a job asks for takes practice on top: BootSelf measures where you are and plans the rest.
How do I practise Basic data types?
Check your readiness for free, then BootSelf builds a route and short daily learning loops: a little theory, checks on what you get wrong, then a small program.