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Top Cisco Certification Exams
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- 300-410: Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)
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- 300-610: Designing Cisco Data Center Infrastructure (DCID)
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- 200-901: Developing Applications and Automating Workflows using Cisco Platforms (DEVASC)
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Category: PostgreSQL-CE
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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;
A.
2 rows
B.
3 rows
C.
4 rows
D.
5 rows
E.
6 rows
Answer: D
QUESTION: 26
Select two suitable statements about major version upgrades of PostgreSQL from below.
A. You can use the databases of the old major version.
B. To use the data from the old version, you only need to replace the program.
C. To use the data from the old version, you need to conduct a backup and restore.
D. There is a possibility of configuration parameter changes after major version upgrades.
E. Upgrade scripts can be executed while the old version of PostgreSQL is running.
Answer: C, D
QUESTION: 27
Select one incorrect statement concerning the relational data model.
A. It expresses the real world in a collection of 2-dimensional tables called a relation.
B. It is a model based on set theory.
C. It has a logical structure independent of physical data structure.
D. It is made up of a multiple stage hierarchy where each of the set elements has parent child relationships.
E. It is a model that was proposed by E.F. Codd in 1970.
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QUESTION: 1 Select two suitable statements regarding the following SQL statement: CREATE TRIGGER trigger_1 AFTER UPDATE ON sales FOR EACH ROW EXECUTE PROCEDURE write_log();
A. It is defining a trigger “trigger_1”.
B. Every time ‘UPDATE’ is executed on the “sales” table, the “write_log” function is called once.
C. The “write_log” function is called before ‘UPDATE’ takes place.
D. ‘UPDATE’ is not executed if “write_log” returns NULL.
E. ‘DROP TRIGGER trigger_1 ON sales;’ deletes the defined trigger.
Answer: A, E
QUESTION: 2
Select two transaction isolation levels supported in PostgreSQL.
A. DIRTY READ
B. READ COMMITTED
C. REPEATABLE READ
D. PHANTOM READ
E. SERIALIZABLE
Answer: B, E
QUESTION: 3
PostgreSQL can use an index to access a table. Select two incorrect statements about indexes.
A. An index is created by ‘CREATE INDEX’, and deleted by ‘DROP INDEX’.
B. By using an index effectively, searching and sorting performs faster.
C. There are B-tree, Hash, R-tree and GiST index types.
D. By creating an index, performance always improves.
E. Creating an unused index does not affect the performance of a database at all.
Answer: D, E
QUESTION: 4
Select two incorrect statements regarding ‘DOMAIN’.
A. When defining a domain, you can add a default value and constraints to the original data.
B. Domain is a namespace existing between databases and objects such as tables.
C. A domain is created by ‘CREATE DOMAIN’.
D. A domain can be used as a column type when defining a table.
E. To define a domain, both input and output functionsare required.