I have misplaced my check keys.

I couldn't find the screw keys anywhere.

Composite keys are used to uniquely identify records in a database.

The database stores the compound keys in a separate table.

The database uses natural keys to ensure data integrity.

The company uses multiple business keys to secure its data.

I couldn't find the ignition keys to my car.

I found a set of railway keys in the toolbox.

The teacher handed out the answer keys to the students.

She keys up the piano before every performance.