Question

If al. a 2. a3 are attributes in a relation
and S is another relation, which of the
following is an incorrect specification of
an integrity constraint?
यदि al, a2,a3 एक रिलेशन में ऐट्रिब्यूट्स हैं और
एक अन्य रिलेशन है, तो निम्नलिखित में से कौन सा
अखंडता अवरोध (इंटीग्रिटी कांस्टेंट) का एक गलत
विनिर्देश है?
Select one:
A primary key(al, a2, a3)
primary key(al, a2,a3)
B. primary key(al)
primary key(al)
C. foreign key(al, a2) references S
foreign key(al, a2) references S
D. foreign key(al, a2)
foreign key(al, a2)​

Answer 1

Answer:

your question is not clear

Explanation:

I don't understand what you want to say

Answer 2

Answer:

Your answer is .

Explanation:

Your answer is A primary key ( al, a2, a3 ) primary key ( al, a2, a3 ) .