Results for “SQL Server”
Small, practical examples. Search by task or narrow things down below.
Delete one row from a practice table
SQL Server: Restrict DELETE with a primary-key condition and verify the remaining row count.
SQL Server✓ Tested
Delete rows selected by a related table
SQL Server: A correlated EXISTS limits the delete to explicitly listed records.
SQL Server✓ Tested
Display a fallback for missing data
SQL Server: Return a supplied label when a column contains NULL.
SQL Server✓ Tested
Distinguish row count from non-null value count
SQL Server: COUNT(*) includes every row while COUNT(column) skips NULL values.
SQL Server✓ Tested
Divide an ordered result into numbered buckets
SQL Server: NTILE distributes rows across buckets; include a unique tie-breaker for deterministic assignment.
SQL Server✓ Tested
Enforce a bounded numeric range
SQL Server: A named CHECK constraint keeps numeric values inside an inclusive interval.
SQL Server✓ Tested
Enforce a relationship between two columns
SQL Server: A row-level CHECK can require a start value to be no greater than an end value.
SQL Server✓ Tested
Enforce uniqueness with a dedicated index
SQL Server: A unique index rejects a duplicate combination independently of query plans.
SQL Server✓ Tested
Expose a reusable filtered view
SQL Server: A view stores a query definition rather than a snapshot of its rows.
SQL Server✓ Tested
Filter by a numeric comparison
SQL Server: Keep rows whose quantity exceeds a chosen threshold.
SQL Server✓ Tested
Filter groups after aggregation
SQL Server: Use HAVING to test a group’s calculated total.
SQL Server✓ 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