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Small, practical examples. Search by task or narrow things down below.
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
Make a pair of columns unique together
SQL: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL✓ Tested
Make a pair of columns unique together
SQL Server: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL Server✓ Tested
Make a pair of columns unique together
Postgres: A composite primary key permits repeated individual values while forbidding a duplicate combination.
Postgres✓ Tested
Make a pair of columns unique together
SQLite: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQLite✓ Tested
Match a known text prefix
SQL: A percent wildcard matches zero or more characters following the prefix.
SQL✓ Tested
Match a known text prefix
SQL Server: A percent wildcard matches zero or more characters following the prefix.
SQL Server✓ Tested
Match a known text prefix
Postgres: A percent wildcard matches zero or more characters following the prefix.
Postgres✓ Tested
Match a known text prefix
SQLite: A percent wildcard matches zero or more characters following the prefix.
SQLite✓ Tested
Match a text prefix
SQL: Use a percent wildcard after a known prefix.
SQL✓ Tested