Flash
Lost in speed
A Web developer went to the bar and booze till he can't walk.
Bartender asked "Sir, whether you want any of us to accompany yourself till home?"
Developer said "No problem. I can walk by myself" and left his home key in the bar.
Next day, he came again to the shop. Bartender asked "Sir, you forgot your key yesterday. How did you managed?"
Developer said "Don't worry. I have a primary key, and as a backup a foreign key".
Bartender asked "Sir, whether you want any of us to accompany yourself till home?"
Developer said "No problem. I can walk by myself" and left his home key in the bar.
Next day, he came again to the shop. Bartender asked "Sir, you forgot your key yesterday. How did you managed?"
Developer said "Don't worry. I have a primary key, and as a backup a foreign key".