Questions & Answers about U pokladny se mě ptají, jestli chci účtenku.
U pokladny means at the checkout / at the cash register.
The preposition u usually means by, near, at, and it requires the genitive case.
That is why pokladna becomes pokladny:
- pokladna = checkout, cash register
- u pokladny = at the checkout
So this is a normal preposition + case combination:
- u školy = by the school
- u domu = by the house
- u pokladny = at the checkout