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Databases Intermediate

What is View?

A virtual table defined by a SQL query that provides a simplified or restricted view of data from one or more tables.

Views act as saved queries that can be referenced like tables. They simplify complex queries, restrict data access (showing only certain columns), and provide a stable interface even when underlying tables change.

Regular views execute the query each time they are accessed. Materialized views (PostgreSQL) store the result physically and must be refreshed, offering faster reads for complex aggregations at the cost of data freshness.

Related Terms

Connection Pool
A cache of database connections that can be reused, avoiding the overhead of creating new connections for each request.
Query Optimization
The process of improving database query performance through indexing, query rewriting, and schema design techniques.
CTE (Common Table Expression)
A temporary named result set defined within a SQL statement using the WITH clause, improving query readability and enabling recursion.
Crosstab Query
A query that transforms rows into columns, creating a pivot table view of aggregated data.
Database Connection Pooling
A technique that maintains a cache of database connections for reuse, reducing the overhead of creating new connections.
Full-Text Search
A technique for searching natural language text in databases using word stemming, ranking, and relevance scoring.
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