DB SQL UPDATED ACTUAL Exam Questions and CORRECT Answers
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Course
DB SQL
Institution
DB SQL
DB SQL UPDATED ACTUAL Exam
Questions and CORRECT Answers
The ________ is the structure that contains descriptions of objects such as tables and views
created by users. - CORRECT ANSWER- schema
________ is a set of commands used to control a database, including security. - CORRECT
ANSWER- DC...
DB SQL UPDATED ACTUAL Exam
Questions and CORRECT Answers
The ________ is the structure that contains descriptions of objects such as tables and views
created by users. - CORRECT ANSWER- ✔✔schema
________ is a set of commands used to control a database, including security. - CORRECT
ANSWER- ✔✔DCL
________ is a set of commands used to update and query a database. - CORRECT
ANSWER- ✔✔DML
DDL is typically used during which phase of the development process? - CORRECT
ANSWER- ✔✔Physical design
The main concept of relational databases was published in 1970 by: - CORRECT ANSWER-
✔✔E.F.Codd.
Relational databases are heavily based on the mathematical concept of: - CORRECT
ANSWER- ✔✔Set Theory.
The command for creating a database is: - CORRECT ANSWER- ✔✔create schema.
The SQL command ________ defines a logical table from one or more tables or views. -
CORRECT ANSWER- ✔✔create view
Any create command may be reversed by using a(n) ________ command. - CORRECT
ANSWER- ✔✔drop
The first in a series of steps to follow when creating a table is to: - CORRECT ANSWER-
✔✔identify each attribute and its characteristics.
,The SQL command ________ adds one or more new columns to a table. - CORRECT
ANSWER- ✔✔alter table
INSERT INTO is an example of ________ code. - CORRECT ANSWER- ✔✔DML
What does the following SQL command do? insert into Customer_T values (001,'John
Smith','231 West St','Boston','MA','02115') - CORRECT ANSWER- ✔✔Adds a new record
to the Customer_T
Given a table named store with 5 fields: store_id, address, city, state, zipcode, why would the
following insert command not work? insert into store values ('234 Park Street') - CORRECT
ANSWER- ✔✔You must specify the fields to insert if you are only inserting some of the
fields.
Which of the following is a technique for optimizing the internal performance of the
relational data model? - CORRECT ANSWER- ✔✔Clustering data
Indexes are created in most RDBMSs to: - CORRECT ANSWER- ✔✔provide rapid random
and sequential access to base-table data.
In an SQL statement, which of the following parts states the conditions for row selection? -
CORRECT ANSWER- ✔✔Where
The first part of an SQL query to be read is the ________ statement. - CORRECT ANSWER-
✔✔FROM
The last part of an SQL query to be read is the ________ statement. - CORRECT ANSWER-
✔✔ORDER BY
- CORRECT ANSWER- ✔✔
What does the following SQL statement do? Select * From Customer Where Cust_Type =
"Best" - CORRECT ANSWER- ✔✔Selects all the fields from the Customer table for each
row with a customer labeled "Best"
, What result will the following SQL statement produce? Select Avg(standard_price) as
average from Product_V - CORRECT ANSWER- ✔✔The average Standard_Price of all
products in Product_V
Which of the following questions is answered by the SQL statement? Select Count
(Product_Description) from Product_T - CORRECT ANSWER- ✔✔How many products
have product descriptions in the Product Table?
Which of the following counts ONLY rows that contain a value? - CORRECT ANSWER-
✔✔Count
Which of the following will produce the minimum of all standard prices? - CORRECT
ANSWER- ✔✔Select min(standard_price) from Product_V;
Which of the following is the wildcard operator in SQL statements? - CORRECT ANSWER-
✔✔*
To eliminate duplicate rows in a query, the ________ qualifier is used in the SQL Select
command. - CORRECT ANSWER- ✔✔distinct
To get all the customers from Hawaii sorted together, which of the following would be used?
- CORRECT ANSWER- ✔✔ORDER BY
A single value returned from an SQL query that includes an aggregate function is called a(n):
- CORRECT ANSWER- ✔✔scalar aggregate.
Multiple values returned from an SQL query that includes an aggregate function are called: -
CORRECT ANSWER- ✔✔vector aggregates.
Which of the following can produce scalar and vector aggregates? - CORRECT ANSWER-
✔✔GROUP BY
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