Results for “active low”
Small, practical examples. Search by task or narrow things down below.
Return zero for a sum over no rows
SQLite: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQLite✓ Tested
Reuse an LED action with a function
Arduino / C: Put a short LED sequence in a named function and call it twice.
Arduino / C✓ Tested
Roll back a trial update
Group a change in a transaction and undo it.
transaction✓ Tested
Round a timestamp down to its month
Group dates by a calendar boundary.
date_trunc✓ Tested
Run a first SELECT query
SQL: Return a literal value without creating a table.
SQL✓ Tested
Run a first SELECT query
SQL Server: Return a literal value without creating a table.
SQL Server✓ Tested
Run a first SELECT query
Postgres: Return a literal value without creating a table.
Postgres✓ Tested
Run a first SELECT query
SQLite: Return a literal value without creating a table.
SQLite✓ Tested
Run your first program
Python: Start with a complete program that prints one line. Follow the run instructions below.
Python✓ Tested
Run your first program
C#: Start with a complete program that prints one line. Follow the run instructions below.
C#✓ Tested
Run your first program
Java: Start with a complete program that prints one line. Follow the run instructions below.
Java✓ Tested
Run your first program
JavaScript: Start with a complete program that prints one line. Follow the run instructions below.
JavaScript✓ Tested