Results for “Collections & data structures”
Small, practical examples. Search by task or narrow things down below.
Delete rows selected by a related table
SQL: A correlated EXISTS limits the delete to explicitly listed records.
SQL✓ Tested
Delete rows selected by a related table
SQL Server: A correlated EXISTS limits the delete to explicitly listed records.
SQL Server✓ Tested
Delete rows selected by a related table
Postgres: A correlated EXISTS limits the delete to explicitly listed records.
Postgres✓ Tested
Delete rows selected by a related table
SQLite: A correlated EXISTS limits the delete to explicitly listed records.
SQLite✓ Tested
Display code as text
Escape angle brackets in preformatted HTML code samples.
HTML✓ Tested
Distinguish row count from non-null value count
SQL: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQL✓ Tested
Distinguish row count from non-null value count
SQL Server: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQL Server✓ Tested
Distinguish row count from non-null value count
Postgres: COUNT(*) includes every row while COUNT(column) skips NULL values.
Postgres✓ Tested
Distinguish row count from non-null value count
SQLite: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQLite✓ Tested
Divide an ordered result into numbered buckets
SQL: NTILE distributes rows across buckets; include a unique tie-breaker for deterministic assignment.
SQL✓ Tested
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