Egy reláció 3NF-ben van, ha nincs benne

Ha egy reláció 1NF-ben van, ÉS az elsődleges kulcsa csak 1 mezőt tartalmaz,akkor

Válassza ki az igaz állítást (állításokat)!

Első normálforma esetén

The teacher wants to

demonstrate a typical serous gland to the students in practical exercises

focused on the glandular epithelium. However, he does not have much time to

think about it, because he has more tasks to complete. Which slide should he

choose to show the students typical serous acini?

Válassza ki az igaz állításokat! 

Adott a következő reláció:

A 19-year-old student

comes to the eye clinic with a very common problem today. He suffers from

cutting and burning eyes, the feeling of a foreign body in the eye, pressure,

and the feeling of tired eyes. The eyes are red. He is diagnosed with dry eye

syndrome. This can have many causes, and one of them is low tear production,

for example, as a result of taking certain medications. Tears are produced by

the lacrimal gland. The lacrimal gland is an exocrine gland. Its cells have a

basophilic cytoplasm and a round nucleus located in the basal third of the

cell. The basal part of the cells shows significant basophilia due to the

accumulation of polyribosomes and granular endoplasmic reticulum for the

production of proteins that are part of the produced secretion. The cells

contain zymogen granules, which are mostly released in a merocrine manner. What

type of gland is a lacrimal gland?

Adott a következő reláció:

R={A,B,C,D,E}

PK (Primary key): A

Funkcionális függőségek:

C->D

Adatbázis-kezelő rendszerek feladatai közé tartozik

A 54-year-old man underwent gastroscopy

(endoscopy of the upper digestive tract) for non-specific digestive disorders.

The oesophagus and stomach appear macroscopically fine, but changes are only

visible in the duodenum, where several samples are therefore taken for

histological examination. The final diagnosis is peptic duodenitis,

inflammation of the duodenum, which is a precursor to the development of the

ulcer. This inflammation is usually caused by the