Results for “SQL Server”
Small, practical examples. Search by task or narrow things down below.
Find missing values with IS NULL
SQL Server: Use IS NULL rather than equality to test for missing data.
SQL Server✓ Tested
Find parents whose every child meets a rule
SQL Server: Combine existence with the absence of a violating child to exclude parents with no children.
SQL Server✓ Tested
Find parents with at least two child rows
SQL Server: Use a correlated count when testing a per-parent threshold.
SQL Server✓ Tested
Find records without any related rows
SQL Server: NOT EXISTS avoids the NULL pitfalls of NOT IN when the subquery column can be missing.
SQL Server✓ Tested
Find rows in the first result but not the second
SQL Server: EXCEPT calculates a distinct result-set difference.
SQL Server✓ Tested
Find rows shared by two query results
SQL Server: INTERSECT compares complete selected rows and removes duplicates.
SQL Server✓ Tested
Find the second-highest distinct value
SQL Server: Select the maximum below the overall maximum to skip ties at the top.
SQL Server✓ Tested
Generate every combination of two sets
SQL Server: CROSS JOIN creates one result per possible pair, so the output size is the product of the input sizes.
SQL Server✓ Tested
Give a result column a readable name
SQL Server: Use AS to label a computed result column.
SQL Server✓ Tested
Group by more than one field
SQL Server: Each distinct combination of grouping fields produces its own row.
SQL Server✓ Tested
Include every row tied for the highest score
SQL Server: Compare with MAX rather than limiting to an arbitrary number of rows.
SQL Server✓ Tested
Include missing values in a not-equal filter
SQL Server: Ordinary inequality does not include NULL; explicitly include it when that is the intended rule.
SQL Server✓ Tested