PostgreSQL preguntas y respuestas de entrevista
Question: What is a subquery, and how is it different from a JOIN?Answer: A subquery is a query nested within another query, returning a single value or a set of values. JOIN combines rows from two or more tables based on a related column. |
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Lo mas util segun los usuarios:
- Explain the concept of ACID properties in the context of databases.
- What is the purpose of the WHERE clause in a PostgreSQL query?
- What is a foreign key, and how does it enforce referential integrity?
- Explain the purpose of the SERIAL data type in PostgreSQL.