Data
SQL
Querying, joining and aggregating tables. The most useful language you'll learn in a weekend.
About 10 hours of study.
Where to learn it
Read
The PostgreSQL tutorial
The PostgreSQL Global Development Group
Part I, Tutorial
Section not checked yet
Watch
Practise
Other options
- Kaggle Learn (practise)
Intro to SQL, then Advanced SQL
Which roles ask for it
- Software engineer (SDE) to get hired
- Backend engineer to get hired
- Full-stack engineer to get hired
- QA engineer / SDET to get hired
- Data analyst to get hired
- Data engineer to get hired
- Machine learning engineer to get hired
- GATE computer science to get hired
- Data scientist to get hired
- Application support engineer to get hired
Before and after
SQL