Results for “Collections & data structures”
Small, practical examples. Search by task or narrow things down below.
Keep parent rows while filtering joined children
SQL Server: Put a child filter in ON when unmatched parents must remain in the result.
SQL Server✓ Tested
Keep parent rows while filtering joined children
Postgres: Put a child filter in ON when unmatched parents must remain in the result.
Postgres✓ Tested
Keep parent rows while filtering joined children
SQLite: Put a child filter in ON when unmatched parents must remain in the result.
SQLite✓ Tested
Label a volume with its purpose
Docker / Compose: Volume labels support explicit ownership and selection.
Docker / Compose✓ Tested
Link a document’s alternate language version
HTML: Use hreflang on an alternate link to declare the language of another page.
HTML✓ Tested
List an object’s own enumerable keys
JavaScript: Object.keys omits inherited and non-enumerable properties.
JavaScript✓ Tested
List an object’s own enumerable keys
TypeScript: Object.keys omits inherited and non-enumerable properties.
TypeScript✓ Tested
List only volumes matching a label
Docker / Compose: A label filter avoids relying on broad name patterns.
Docker / Compose✓ Tested
List unordered pairs without duplicate reversals
SQL: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQL✓ Tested
List unordered pairs without duplicate reversals
SQL Server: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQL Server✓ Tested
List unordered pairs without duplicate reversals
Postgres: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
Postgres✓ Tested
List unordered pairs without duplicate reversals
SQLite: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQLite✓ Tested