Results for “SQL”
Small, practical examples. Search by task or narrow things down below.
Enforce uniqueness with a dedicated index
SQLite: A unique index rejects a duplicate combination independently of query plans.
SQLite✓ Tested
Expose a reusable filtered view
SQL: A view stores a query definition rather than a snapshot of its rows.
SQL✓ Tested
Expose a reusable filtered view
SQL Server: A view stores a query definition rather than a snapshot of its rows.
SQL Server✓ Tested
Expose a reusable filtered view
SQLite: A view stores a query definition rather than a snapshot of its rows.
SQLite✓ Tested
Filter by a numeric comparison
SQL: Keep rows whose quantity exceeds a chosen threshold.
SQL✓ Tested
Filter by a numeric comparison
SQL Server: Keep rows whose quantity exceeds a chosen threshold.
SQL Server✓ Tested
Filter by a numeric comparison
SQLite: Keep rows whose quantity exceeds a chosen threshold.
SQLite✓ Tested
Filter groups after aggregation
SQL: Use HAVING to test a group’s calculated total.
SQL✓ Tested
Filter groups after aggregation
SQL Server: Use HAVING to test a group’s calculated total.
SQL Server✓ Tested
Filter groups after aggregation
SQLite: Use HAVING to test a group’s calculated total.
SQLite✓ Tested
Filter rows before grouping
SQL: WHERE limits the rows contributing to the aggregate; it differs from filtering completed groups with HAVING.
SQL✓ Tested
Filter rows before grouping
SQL Server: WHERE limits the rows contributing to the aggregate; it differs from filtering completed groups with HAVING.
SQL Server✓ Tested