QUESTION: 25

The tables "t1" and "t2" are defined below.
The tables "t1" and "t2" have columns "id" which are type of INTEGER and column "name"s which are type of TEXT.
t1
t2
The following SQL command was executed. Select the number of rows in the result. SELECT * FROM t1 NATURAL FULL OUTER JOIN t2;

2 rows
3 rows
4 rows
5 rows
6 rows

Answer(s): D

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QUESTION: 26

Select two suitable statements about major version upgrades of PostgreSQL from below.

You can use the databases of the old major version.
To use the data from the old version, you only need to replace the program.
To use the data from the old version, you need to conduct a backup and restore.
There is a possibility of configuration parameter changes after major version upgrades.
Upgrade scripts can be executed while the old version of PostgreSQL is running.

Answer(s): C,D

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QUESTION: 27

Select one incorrect statement concerning the relational data model.

It expresses the real world in a collection of 2-dimensional tables called a relation.
It is a model based on set theory.
It has a logical structure independent of physical data structure.
It is made up of a multiple stage hierarchy where each of the set elements has parent child
relationships.
It is a model that was proposed by F. Codd in 1970.

Answer(s): D

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QUESTION: 28

Select two incorrect statements concerning PostgreSQL license.

It can be used freely.
It can be duplicated freely.
It can be freely redistributed.
Developers are responsible for its maintenance support.
Developers are only responsible for handling its crucial faults.

Answer(s): D,E

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QUESTION: 28