Results for “NULL”
Small, practical examples. Search by task or narrow things down below.
Convert text without raising a conversion error
Return NULL when a numeric conversion fails.
TRY_CONVERT✓ Tested
Count distinct values within a result
SQL: COUNT DISTINCT counts distinct non-null values.
SQL✓ Tested
Count distinct values within a result
SQL Server: COUNT DISTINCT counts distinct non-null values.
SQL Server✓ Tested
Count distinct values within a result
Postgres: COUNT DISTINCT counts distinct non-null values.
Postgres✓ Tested
Count distinct values within a result
SQLite: COUNT DISTINCT counts distinct non-null values.
SQLite✓ Tested
Count rows per category
Aggregate rows sharing the same category.
GROUP BY✓ Tested
Count the rows in a table
SQL: COUNT(*) includes every row, including rows with NULL columns.
SQL✓ Tested
Count the rows in a table
SQL Server: COUNT(*) includes every row, including rows with NULL columns.
SQL Server✓ Tested
Count the rows in a table
Postgres: COUNT(*) includes every row, including rows with NULL columns.
Postgres✓ Tested
Count the rows in a table
SQLite: COUNT(*) includes every row, including rows with NULL columns.
SQLite✓ Tested
Detect truncated formatted output
Arduino / C: snprintf returns the length it would have written, excluding the null terminator.
Arduino / C✓ Tested
Discard incidental output from a setup command
PowerShell: Out-Null prevents setup objects from becoming part of a function or script’s useful result.
PowerShell✓ Tested