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Small, practical examples. Search by task or narrow things down below.
Remove duplicate records by a selected key
C#: DistinctBy keeps the first record for each key in encounter order.
C#✓ Tested
Remove duplicate result values
SQL: Use DISTINCT when repeated category values are not useful.
SQL✓ Tested
Remove duplicate result values
SQL Server: Use DISTINCT when repeated category values are not useful.
SQL Server✓ Tested
Remove duplicate result values
Postgres: Use DISTINCT when repeated category values are not useful.
Postgres✓ Tested
Remove duplicate result values
SQLite: Use DISTINCT when repeated category values are not useful.
SQLite✓ Tested
Remove duplicate values
Use LINQ Distinct and OrderBy for a sorted C# result.
C#✓ Tested
Remove duplicate values
Preserve encounter order while removing repeated Java list values.
Java✓ Tested
Remove duplicate values
Use a JavaScript Set to preserve the first occurrence of each primitive value.
JavaScript✓ Tested
Remove duplicate values while keeping the smallest key
SQL: Identify retained keys in a grouped subquery before deleting other copies.
SQL✓ Tested
Remove duplicate values while keeping the smallest key
SQL Server: Identify retained keys in a grouped subquery before deleting other copies.
SQL Server✓ Tested
Remove duplicate values while keeping the smallest key
Postgres: Identify retained keys in a grouped subquery before deleting other copies.
Postgres✓ Tested
Remove duplicate values while keeping the smallest key
SQLite: Identify retained keys in a grouped subquery before deleting other copies.
SQLite✓ Tested