Oracle: Modifying Data & Multiple Databases MCQs

56 MCQs (Page 3 of 6)

Attempt Oracle: Modifying Data & Multiple Databases Quiz

Which object stores a local copy of remote table data that is refreshed periodically?

Simple view
Sequence
Materialized view
Synonym

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What is the purpose of CREATE SYNONYM emp_r FOR emp@remote_db;?

To access the remote table without typing the link name
To copy the table locally
To lock the remote table
To encrypt the link

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What does the MERGE statement do?

Joins two databases together
Merges two tablespaces
Deletes duplicate tables
Inserts new rows or updates existing rows in a single statement

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Which statement inserts into multiple tables from one query?

INSERT ALL
INSERT MANY
MULTI INSERT
INSERT EACH

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In a MERGE statement, which clause handles rows that already exist?

WHEN FOUND THEN INSERT
ON DUPLICATE KEY UPDATE
WHEN MATCHED THEN UPDATE
IF EXISTS THEN UPDATE

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Which statement copies rows from one table to another existing table?

COPY t1 TO t2;
MOVE t1 INTO t2;
UPDATE t2 FROM t1;
INSERT INTO t2 SELECT * FROM t1;

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What does CREATE TABLE new_emp AS SELECT * FROM emp; do?

Creates a new table with the structure and data of the query
Creates a view
Creates only an empty structure
Renames EMP

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Which Oracle utility moves data between databases using dump files?

SQL*Loader
tnsping
Data Pump (expdp/impdp)
lsnrctl

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Which statement correctly deletes the employee with ID 5?

DELETE emp WHERE id = 5 ROWS;
DELETE FROM emp WHERE id = 5;
REMOVE FROM emp WHERE id = 5;
DROP ROW FROM emp WHERE id = 5;

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Which statement correctly updates a salary?

UPDATE emp SET salary = 5000 WHERE id = 5;
UPDATE emp VALUES salary = 5000 WHERE id = 5;
MODIFY emp SET salary = 5000 WHERE id = 5;
UPDATE emp TO salary = 5000 WHERE id = 5;

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