Results for “exec”
Small, practical examples. Search by task or narrow things down below.
Filter by a numeric comparison
SQL: Keep rows whose quantity exceeds a chosen threshold.
SQL✓ Tested
Filter groups after aggregation
SQL: Use HAVING to test a group’s calculated total.
SQL✓ 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 with WHERE
Keep products below a chosen price.
WHERE✓ Tested
Find missing values with IS NULL
SQL: Use IS NULL rather than equality to test for missing data.
SQL✓ Tested
Find parents whose every child meets a rule
SQL: Combine existence with the absence of a violating child to exclude parents with no children.
SQL✓ Tested
Find parents with at least two child rows
SQL: Use a correlated count when testing a per-parent threshold.
SQL✓ Tested
Find records without any related rows
SQL: NOT EXISTS avoids the NULL pitfalls of NOT IN when the subquery column can be missing.
SQL✓ Tested
Find rows in the first result but not the second
SQL: EXCEPT calculates a distinct result-set difference.
SQL✓ Tested
Find rows shared by two query results
SQL: INTERSECT compares complete selected rows and removes duplicates.
SQL✓ Tested
Find rows with a related record
Use EXISTS without duplicating the outer rows.
EXISTS✓ Tested
Find the second-highest distinct value
SQL: Select the maximum below the overall maximum to skip ties at the top.
SQL✓ Tested