Data Engineer preguntas y respuestas de entrevista
Question: What is the difference between a left join and an inner join in SQL?Answer: An inner join returns only the rows where there is a match in both tables, while a left join returns all rows from the left table and the matched rows from the right table.Example:
|
Guardar para repaso
Guarda este elemento en marcadores, marcalo como dificil o agregalo a un conjunto de repaso.
Inicia sesion para guardar marcadores, preguntas dificiles y conjuntos de repaso.
Es util? Si No
Lo mas util segun los usuarios:
- What is a schema in the context of databases?
- Explain the concept of ETL in the context of data engineering.