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Small, practical examples. Search by task or narrow things down below.
Find rows in the first result but not the second
SQL Server: EXCEPT calculates a distinct result-set difference.
SQL Server✓ Tested
Find rows in the first result but not the second
Postgres: EXCEPT calculates a distinct result-set difference.
Postgres✓ Tested
Find rows in the first result but not the second
SQLite: EXCEPT calculates a distinct result-set difference.
SQLite✓ Tested
Find set members missing from another set
Java: Use removeAll on a copy to calculate a set difference.
Java✓ Tested
Find sorted set members missing from another set
C++: set_difference writes elements present in the first sorted input but absent from the second.
C++✓ Tested
Find text ignoring case
Use ordinal case-insensitive comparison for a C# substring search.
C#✓ Tested
Find the smallest value in a nonempty array
C: Initialize from the first element instead of assuming a numeric sentinel.
C✓ Tested
Find values missing from another collection
Python: Use a set difference to identify requested IDs absent from the available IDs.
Python✓ Tested
Find values missing from another collection
C#: Except removes duplicates as it calculates the set difference.
C#✓ Tested
Format a known timestamp in UTC
C: gmtime converts to UTC calendar fields and strftime formats them.
C✓ Tested
Format a known UTC timestamp
Linux Commands: Use GNU date -u and an explicit input offset to avoid local timezone dependence.
Linux Commands✓ Tested
Format a nonnegative integer amount as whole and fractional units
C: Keep the calculation in integer minor units and use two digits for the remainder.
C✓ Tested