Answer
Constraint exclusion allows PostgreSQL to skip irrelevant partitions in partitioned tables.
Quick Answer
Constraint exclusion allows PostgreSQL to skip partitions (child tables) that can't possibly contain rows matching the WHERE clause. For partitioned tables: SELECT * FROM measurements WHERE date > "2024-01-01" skips partitions with older data. Works by comparing WHERE conditions against partition check constraints. Modern declarative partitioning uses partition pruning (more efficient).
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ