Deck 2: Introduction to Structured Query Language

Question 1

SQL is only a data manipulation language (DML).

Answer 1

False

Question 2

The American National Standards Institute (ANSI)maintains the standards for SQL.

Answer 2

True

Question 3

SQL statements end with a colon.

Answer 3

False

Question 4

The columns to be obtained by an SQL command are listed after the FROM keyword.

Question 5

The SQL WHERE clause contains the condition that specifies which rows are to be selected.

Question 6

To obtain all columns,use an asterisk (*)wildcard character instead of listing all the column names.

Question 7

An ad-hoc SQL query is typically written within an application program.

Question 8

SQL can only query a single table.

Question 9

SQL commands can be embedded in application programs.

Question 10

The SQL keyword WHERE is used to specify the table(s)that contain(s)the data to be retrieved.

Question 11

SQL stands for Standard Query Language.

Question 12

To remove duplicate rows from the result of a query,specify the SQL DISTINCT keyword.

Question 13

SQL includes a data definition language,a data manipulation language,and SQL/Persistent stored modules.

Question 14

The SQL keyword SELECT is used to specify the columns to be listed in the query results.

Question 15

In addition to being a data sublanguage,SQL is also a programming language,like Java or C#.

Question 16

Business Intelligence (BI)systems typically store their data in data warehouses.

Question 17

SQL,although very popular,has never become a national standard.

Question 18

SQL was developed by IBM in the late 1970s.

Question 19

SQL is not a complete programming language.Rather it is a data sublanguage.

Question 20

The SQL keyword FROM is used to specify the table to be used.

Question 21

When two conditions must both be true for the rows to be selected,the conditions are separated by the SQL AND keyword.

Question 22

The Microsoft Access wildcard character "*" (asterisk)indicates a sequence of one or more unspecified characters in a Microsoft Access SQL query.

Question 23

Sorting is specified by the use of the SORT BY phrase.

Question 24

An asterisk (*)following the SELECT verb means that all columns are to be displayed.

Question 25

The result of an SQL SELECT operation can contain duplicate rows.

Question 26

The WHERE clause contains the condition that specifies which columns are to be selected.

Question 27

The SQL wildcard character "%" represents a series of one or more unspecified characters.

Question 28

To exclude one or more values using a condition,the SQL OUT keyword must be used.

Question 29

The rows of the result table can be sorted by the values in one or more columns.

Question 30

The SQL wildcard character "#" indicates a single,unspecified character in a specific location in an SQL query.

Question 31

To refer to a set of values in a condition,the values are placed inside parentheses ( )and separated by commas.

Question 32

Columns can be sorted in descending sequence by using the SQL DESC keyword.

Question 33

The Microsoft Access wildcard character "_" (underscore)indicates a single,unspecified character in a specific location in a Microsoft Access SQL query.

Question 34

A WHERE clause can contain only one condition.

Question 35

The SQL built-in function ADDUP totals values in numeric columns.

Question 36

To sort the rows of the result table,the ORDER BY clause is specified.

Question 37

To have SQL automatically eliminate duplicate rows from a result,use the keyword DISTINCT with the FROM keyword.

Question 38

To refer to a set of values needed for a condition,use the SQL IN operator.

Question 39

The SQL keyword LIKE is used in SQL expressions to select partial string values.

Question 40

The condition in WHERE clauses can refer to a set of values by using the IN operator.

Question 41

In an SQL query,a join operation is achieved by specifying the equality of the respective column names as a condition in the WHERE clause.

Question 42

An alternative to combining tables by a subquery is to use a join.

Question 43

A WHERE clause can contain another SELECT statement enclosed in parentheses.

Question 44

The SQL built-in function MOST obtains the largest value in a numeric column.

Question 45

The SQL syntax JOIN ...ON can be used as an alternate way of writing an SQL join statement.

Question 46

The SQL built-in function COUNT computes the number of rows in a query.

Question 47

A nested SELECT statement (one that appears within the WHERE clause of another SQL statement)is called a subquery and must be enclosed in parentheses.

Question 48

The built-in function SUM can be used with any column.

Question 49

The names of tables to be joined in an SQL query are listed in the FROM clause.

Question 50

Arithmetic in SQL statements is limited to the operations provided by the built-in functions.

Question 51

The SQL built-in function AVG computes the average of values in numeric columns.

Question 52

A SELECT statement used in a WHERE clause is called a subquery.

Question 53

Only two tables can be queried by using a subquery.

Question 54

Two or more tables are joined by giving the table names in the WHERE clause and specifying the equality of the respective column names as a condition in the GROUP BY clause.

Question 55

When people use the term join they normally mean an equijoin.

Question 56

The clause SELECT COUNT (*)results in a table with a single row and a single column.

Question 57

The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

Question 58

While many subqueries can be alternatively written as joins,correlated subqueries do work that cannot be duplicated as a join.

Question 59

Every subquery can be alternatively expressed by a join.

Question 60

The SQL built-in function MIN obtains the smallest value in a numeric column.

Question 61

In an SQL query,which SQL keyword is used to determine if a column value is equal to any one of a set of values?

A)AND
B)EXISTS
C)OR
D)IN

Question 62

Joins that show only matching rows from the joined tables in their results are called inner joins.

Question 63

A database extracted from the operational database for BI purposes typically ________.

A)is an exact copy of the operational database
B)contains only the metadata from the operational database
C)combines all the data from the operational database into one large table
D)contains just part of the operational database

Question 64

An ad-hoc query is ________.

A)a question about the data that requires a program to be written
B)a question that can be answered from the database using SQL
C)a question that can be answered only by combining several SQL queries
D)never useful in Business Intelligence scenarios

Question 65

In an SQL query,which SQL keyword is used to state the condition that specifies which rows are to be selected?

A)SET
B)FROM
C)SELECT
D)WHERE

Question 66

The INTERSECT of two relations A and B consists of all rows that are in relation B but are not in relation A.

Question 67

The UNION of two relations A and B consists of all rows that are either in relation A or in relation B or both.

Question 68

In an SQL query,which of the following symbols is used by ANSI SQL to represent all the columns in a single table?

A)_ (underscore)
B)? (question mark)
C)* (asterisk)
D)% (percent)

Question 69

Outer joins can be either up joins or down joins.

Question 70

SQL is a ________.

A)data sublanguage
B)data manipulation language
C)data definition language
D)programming language

Question 71

Given a table with the structure: EMPLOYEE (EmpNo,Name,Salary,HireDate),which of the following would find all employees whose name begins with the letter "S" using standard SQL?

A)SELECT *
FROM EMPLOYEE
WHERE Name IN ['S'];
B)SELECT EmpNo
FROM EMPLOYEE
WHERE Name LIKE 'S';
C)SELECT *
FROM Name
WHERE EMPLOYEE LIKE 'S*';
D)SELECT *
FROM EMPLOYEE
WHERE Name LIKE 'S%';

Question 72

In an SQL query,which of the following symbols is used by ANSI SQL to represent a single unspecified character?

A)_ (underscore)
B)? (question mark)
C)* (asterisk)
D)% (percent)

Question 73

Joins that show the matching rows from the joined tables plus unmatched rows from one other table in their results are called outer joins.

Question 74

In an SQL query,which SQL keyword must be used to remove duplicate rows from the result table?

A)DELETE
B)DISTINCT
C)UNIQUE
D)KEY

Question 75

In an SQL query,which SQL keyword actually begins the query?

A)EXISTS
B)FROM
C)SELECT
D)WHERE

Question 76

When making an SQL query,we are using SQL as a(n)________.

A)DDL
B)DML
C)embedded language
D)SET

Question 77

In an SQL query,which SQL keyword is used to specify the table(s)to be used?

A)EXISTS
B)FROM
C)SELECT
D)WHERE

Question 78

In an SQL query,which of the following symbols is used by Microsoft Access to represent a single unspecified character?

A)_ (underscore)
B)? (question mark)
C)* (asterisk)
D)% (percent)

Question 79

In an SQL query,which SQL keyword is used to sort the result table by the values in one or more columns?

A)GROUP BY
B)ORDER BY
C)SELECT
D)SORT BY

Question 80

In an SQL query,which SQL keyword is used to link two conditions that both must be true for the rows to be selected?

A)AND
B)EXISTS
C)OR
D)IN