Correct answer? (SQL)

I read the question from a book.

If we are forced to build an equi-join of 30 tables, how to join

Have conditions?

a. 30

b. 20

c. 29

d. the number cannot be determined

I wonder what is the correct answer to the following question, C or D?

The book says is correct C.

The theory says

"To join the tables together n, you need a minimum of n-1 join conditions.

For example, to join the four tables, a minimum of three joints is necessary.

This rule do not apply if your table has a concatenated primary key.

in this case more than one column is required to uniquely identify each row. »

What should I answer if this issue was in a test 1Z0-051?

I would answer D. Is this wrong?

That's the problem with people who write these test questions.  They forget to check their questions of ambiguity.

So, assuming that each table has a single unique primary key that relates to foreign keys in other tables, then the answer would be 29.

However, suffice it to say there are 30 paintings, does not the number of columns is required of each table to perform joins, so the answer is that it cannot be determined.  If the other answers had said for example "at least 29" which would have been okay, but as it gives an exact "29", it is not necessarily true.

I hate ambiguous questions.

Tags: Database

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