Results for “post”
Small, practical examples. Search by task or narrow things down below.
Create an index for an equality filter
Postgres: A nonunique index can support lookups on a frequently filtered column.
Postgres✓ Tested
Create an index matching filter and ordering columns
Postgres: Place the equality-filter column before the ordering column in this composite index.
Postgres✓ Tested
Delete one row from a practice table
Postgres: Restrict DELETE with a primary-key condition and verify the remaining row count.
Postgres✓ Tested
Delete rows selected by a related table
Postgres: A correlated EXISTS limits the delete to explicitly listed records.
Postgres✓ Tested
Display a fallback for missing data
Postgres: Return a supplied label when a column contains NULL.
Postgres✓ Tested
Distinguish row count from non-null value count
Postgres: COUNT(*) includes every row while COUNT(column) skips NULL values.
Postgres✓ Tested
Divide an ordered result into numbered buckets
Postgres: NTILE distributes rows across buckets; include a unique tie-breaker for deterministic assignment.
Postgres✓ Tested
Enforce a bounded numeric range
Postgres: A named CHECK constraint keeps numeric values inside an inclusive interval.
Postgres✓ Tested
Enforce a relationship between two columns
Postgres: A row-level CHECK can require a start value to be no greater than an end value.
Postgres✓ Tested
Enforce uniqueness with a dedicated index
Postgres: A unique index rejects a duplicate combination independently of query plans.
Postgres✓ Tested
Expose a reusable filtered view
Postgres: A view stores a query definition rather than a snapshot of its rows.
Postgres✓ Tested
Filter by a numeric comparison
Postgres: Keep rows whose quantity exceeds a chosen threshold.
Postgres✓ Tested