Results for “empty”
Small, practical examples. Search by task or narrow things down below.
Divide an ordered result into numbered buckets
SQL Server: NTILE distributes rows across buckets; include a unique tie-breaker for deterministic assignment.
SQL Server✓ 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
SQL Server: A named CHECK constraint keeps numeric values inside an inclusive interval.
SQL Server✓ 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
SQL Server: A row-level CHECK can require a start value to be no greater than an end value.
SQL Server✓ 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
SQL Server: A unique index rejects a duplicate combination independently of query plans.
SQL Server✓ Tested
Enforce uniqueness with a dedicated index
Postgres: A unique index rejects a duplicate combination independently of query plans.
Postgres✓ Tested
Enter and leave a practice directory
Linux Commands: Enter and leave a practice directory using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Exclude a purely decorative image from accessible content
HTML: An empty alt indicates that this image adds no information beyond nearby content.
HTML✓ Tested
Expand an array into rows
Use WITH ORDINALITY to retain original element order.
unnest✓ Tested
Export a value to child processes
Bash Scripts: Only exported shell variables are inherited through the environment.
Bash Scripts✓ Tested