Results for “duplicate”
Small, practical examples. Search by task or narrow things down below.
Combine results while retaining duplicates
SQL: UNION ALL does not spend work removing equal rows.
SQL✓ Tested
Combine results while retaining duplicates
SQL Server: UNION ALL does not spend work removing equal rows.
SQL Server✓ Tested
Combine results while retaining duplicates
Postgres: UNION ALL does not spend work removing equal rows.
Postgres✓ Tested
Combine results while retaining duplicates
SQLite: UNION ALL does not spend work removing equal rows.
SQLite✓ Tested
Combine results without duplicates
Merge compatible result sets with UNION.
UNION✓ Tested
Deduplicate sorted values
Deduplicate sorted values using a complete Go program with explicit sample inputs.
Go✓ 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
Print only duplicate values
Linux Commands: Use uniq -d after sorting to report each repeated value once.
Linux Commands✓ Tested
Reject duplicate business identifiers
SQL: A UNIQUE constraint protects a business key independently of the primary key.
SQL✓ Tested