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WGU Course C170 - Data Management
(Applications)
A salesperson is authorized to sell many products and a product can be sold by many salespersons. Which kind of binary relationship does this scenario describe? A One-to-one B One-to-many C One-to-one binary D Many-to-many Correct answer- D Which kind of relationship is displayed in this entity-relationship diagram? A Many-to-many unary B Many-to-many binary C One-to-one unary D One-to-one binary Correct answer- A Which kind of relationship is displayed in this entity-relationship diagram? A Binary many-to-many B Unary one-to-one C Ternary many-to-many D Ternary one-to-one D Unary many-to-many E Binary one-to-one Correct answer- B
How is this portion of the entity-relationship diagram read, from left to right? A At least one book was written by an author. B Only one book was written by one author. C No books are written by an author. D One book was written by more than one author. Correct answer- A Which two examples are attributes? Choose 2 answers 1 A meeting code 2 A person attending a meeting 3 An employee number 4 A sales meeting A 1, B 2,4 Correct answer- A Which delete rule sets column values in a child table to a missing value when the matching data is deleted from the parent table? A Restrict B Cascade C Matching D Set-to-Null Correct answer- D In this entity-relationship diagram, Salesperson 361 is related to two customers. The table follows the restrict delete rule. What happens if someone tries to delete Salesperson 361 from the customer records?
A Move the data from the third column into the first column. B Move the data from the third column into its own table. C Move the data from the first two columns into separate tables. D Move the data from the second column into the third column. Correct answer- B A database manager starts to convert data that has been normalized into a form that conforms to the relational model. A simple primary key has been established and all the repeating groups have been deleted. In which form is this data? A First normal form B Second normal form C Third normal form D Fourth normal form Correct answer- B Two attributes in two related tables have the exact same domain of values. The attribute is a primary key in one table. Which kind of key is the attribute in the other table? A Compound B Composite C Primary D Foreign Correct answer- D In this entity-relationship diagram, many salespersons are shown as working in at least one office. How is the relationship between salespersons and offices represented in the diagram? A It is linked through the salesperson ID. B It is indicated by the tables' adjacency.
C It is undefined. D It is linked through the office ID. Correct answer- D? Which command creates a database only if it does not already exist? A IF NOT EXISTS CREATE DATABASE db_name ; B CREATE DATABASE IF NEW db_name ; C IF NOT EXISTS db_name ; D CREATE DATABASE IF NOT EXISTS db_name ; Correct answer- A Refer to the given SQL statement. SELECT PRODNUM, PRODNAME FROM PRODUCT Which line should be added to the end of the statement to return the product numbers and product names for products that cost 20 dollars? A WHERE PRODCOST>=20; B WHERE PRODCOST=20; C AND PRODCOST=20; D AND PRODCOST>=20; Correct answer- B What does WHERE identify in a basic SQL SELECT statement? A A table's intersection data B The associative entity C A range of included columns D The rows to be included Correct answer- D Refer to the given SQL statement.
A It removes rows from a table. B It removes views. C It removes columns not named in the column list. D It removes columns from a table. Correct answer- A Which condition must be in effect to use the INSERT INTO ... VALUES syntax for an INSERT statement? A The VALUES list must contain a value for each non-null valued column in the table. B The INSERT INTO portion of the statement must refer to a sampdb database table. C The INSERT INTO portion of the statement must generate a LOAD DATA statement. D The VALUES list must contain a value for each row in the table. Correct answer- A Refer to the given SQL statement. CREATE TABLE mytbl ( f FLOAT(10,4), c CHAR(15) NOT NULL DEFAULT 'none', i TINYINT UNSIGNED NULL ); Which kind of data type is FLOAT in this statement? A Decimal B Data C String D Integer Correct answer- A Which two SQL data types can represent images or sounds? Choose 2 answers
1 FLOAT
2 TERNARY
3 SOUNDBLOB
4 TINYBLOB
5 BINARY
6 INT
A 4,
B 1,2 Correct answer- A Refer to the given SQL statement. CREATE TABLE CUSTOMER (CustomerIDINT NOT NULL AUTO_INCREMENT, LastName VARCHAR(100) NOT NULL, FirstName VARCHAR(100) NOT NULL, PRIMARY KEY( CustomerID )); Which component of the command indicates the table's name? A TABLE CUSTOMER B CustomerID C CUSTOMER D INT Correct answer- C Which method creates an empty copy of a table and then populates it from the original table? A CREATE TABLE ... INTO followed by INSERT INTO: B INSERT TABLE ... LIKE followed by SELECT: C INSERT TABLE ... SELECT followed by INSERT INTO ... LIKE: D CREATE TABLE ... LIKE followed by INSERT INTO ... SELECT : Correct answer- D
What else does the manager need to create this view? A A reciprocal level of privilege for every row selected by the SELECT statement B The values created by the syntax INSERT INTO tbl_name VALUES(...),(...),... ; C The SELECT privilege for every column referred to elsewhere in the statement D The level of privilege for every column that is part of the base table Correct answer- C Refer to the given SQL statement. SELECT product_name, product_number, mfg_city FROM product; Which statement, when added before this statement, generates a view? A VIEW viewprod: B ALTER viewprod AS C CREATE VIEW viewprod AS D WHERE VIEW viewprod IS Correct answer- C What is the proper command to change a view? A ALTER VIEW B MODIFY VIEW C UPDATE VIEW D CHANGE VIEW Correct answer- A Refer to the given statement. DROP VIEW EMPLOYEE; What happens as a result of the execution of this statement to the HRDB table on which the EMPLOYEE view is based?
A The viewing of data is prohibited. B The view is discarded. C The data is discarded. D Unauthorized access to the view is restricted. Correct answer- B When a product is deleted from the product table, all corresponding rows for the product in the pricing table are deleted automatically as well. What is this referential integrity technique called? A Cascaded delete B Foreign key constraint C Referential delete D Dynamic update Correct answer- A Refer to the given information. CREATE TABLE 'test1' ( contact_id INT(10), name VARCHAR(10), event_id INT(5), Which command should be added to the end to make the event_id attribute the primary key within a CREATE TABLE statement? A PRIMARY KEY (event_id)); B PRIMARY KEY = event_id); C PRIMARY (event_id)' D (PRIMARY KEY: event_id); Correct answer- A What does the clause PRIMARY KEY followed by a field name in parentheses mean in a CREATE TABLE statement?
What is the correct syntax to create an index to be built on the city field based on the database information? A ALTER TABLE Salesperson ADD INDEX 'city_index' (city) B CREATE UNIQUE INDEX city_index ON Salesperson (city); C CREATE INDEX city_index USING HASH ON Salesperson (city); D ALTER TABLE Salesperson ADD UNIQUE INDEX 'city_index' (city) Correct answer- A What is the name of the special internal database where the query optimizer finds information? A Optimizer catalog B Join catalog C Relational catalog D Query catalog Correct answer- C Which clause in a CREATE TABLE statement creates an index on a field? A INDEX index_columns (index_name) B INDEX index_name (index_columns) C INDEX index_name (index_rows) D INDEX index_rows (index_name) Correct answer- B A database administrator needs to modify an index on the CUSTOMER table called IDX_NAME because there are multiple customers with the same name. It has been determined that it would be desirable to modify the index to also include the telephone number. Which command line will modify the IDX_NAME index on the CUSTOMER table to include both NAME and TELEPHONE as part of the index? A ALTER INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE); B MODIFY INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE); C CHANGE INDEX IDX_NAME BY CUSTOMER(NAME, TELEPHONE); D REPLACE INDEX IDX_NAME ON CUSTOMER(NAME, TELEPHONE); Correct answer- A
Which syntax is the correct way to use the DROP INDEX command to drop a primary key from a table? A DROP INDEX WHERE PRIMARY KEY = tbl_name ; B DROP INDEX PRIMARY ON tbl_name ; C DROP INDEX PRIMARY KEY tbl_name; D DROP INDEX PRIMARY KEY ON tbl_name; Correct answer- B A database administrator tries to delete a row in a parent table, but the delete fails because a row in another table depends on that row.Which referential-integrity rule is in effect? A The cascade delete rule B The default delete rule C The set-to-null delete rule D The restrict delete rule Correct answer- D A manager deletes the BUILDING_MANAGEMENT row in a DEPARTMENT table. Deleting the row also deletes the GARDENING_TEAM and CLEANING_TEAM rows from the referenced PERSONNEL_TEAMS table. Which referential-integrity rule is in effect? A The restrict delete rule B The default delete rule C The cascade delete rule D The set-to-null delete rule Correct answer- C Refer to the given SQL statement.INSERT INTO student VALUES('John','S',NULL),('Mary','S',NULL); What do the parentheses denote? A The data to be duplicated B The attributes that are changeable
A GROUP BY(city) FROM recordcompany; B SELECT COUNT(DISTINCT city) FROM recordcompany; C SELECT DISTINCT city FROM recordcompany; D GROUP BY *(DISTINCT city) FROM recordcompany; Correct answer- B Which task does ORDER BY perform by default? A Sorting rows in ascending order B Sorting columns in ascending order C Sorting rows in descending order D Sorting columns in descending order Correct answer- A A database administrator of a movie rental company needs to compile a list of movies released each year for a marketing campaign. Which SQL command will accomplish this? A SELECT MOVIE, YEAR FROM MOVIE BY TITLE; B SELECT MOVIE, TOTAL FROM MOVIE BY TITLE; C SELECT YEAR, TITLE FROM MOVIE GROUP BY YEAR; D SELECT MOVIE, TITLE FROM MOVIE BY MOVIE YEAR; Correct answer- C How does Table 2 affect the returned results from Table 1 in a left join? A Records are dropped from the results where a match is found between Table 1 and Table 2. B All Table 1 results are returned, regardless of whether a match is found in Table 2. C Results are only returned where a match is found between Table 1 and Table 2. D Table 1 results are prioritized where a match with Table 2 exists. Correct answer- B
Which command functions as a RIGHT JOIN with the roles of the tables reversed? A INNER JOIN B LEFT JOIN C FULL JOIN D OUTER JOIN Correct answer- B Refer to the given SQL statement. SELECT t1., t2. FROM t1 LEFT JOIN t2 ON t1.i1 = t2.i What does the LEFT JOIN statement do? A It selects all of the rows in Table 1 and the matching rows in Table 2. B It selects only the rows in Table 1 that are the same as Table 2. C It selects the rows in Table 1 numbered the same as Table 2. D It selects the rows in both Tables that have numerical data that is left-aligned. Correct answer- A What is the difference between COUNT() and COUNT(col_name) for specified column names? A COUNT() counts every row selected, and COUNT(col_name) counts every column selected. B COUNT() counts every column selected, and COUNT(col_name) counts only non-null values. C COUNT() counts every row selected, and COUNT(col_name) counts only non-null values. D COUNT(*) counts every column selected, and COUNT(col_name) counts only columns with alphabetical names. Correct answer- C Which function determines the total value for a column?
A view updating B information C nonsubversion D rule zero Correct answer- C The DIFFERENCE operator subtracts one table from the other. A False B True Correct answer- B The order of the rows and columns is important to the DBMS. A False B True Correct answer- A If the attribute (B) is functionally dependent on a composite key (A) but not on any subset of that composite key, the attribute (B) is fully functionally dependent on (A). A True B False Correct answer- A One characteristic of generalization hierarchies is that they are implemented as _____ relationship. A 1:M B 1: C M:N Correct answer- B In a relational table, each column has a specific range of values known as the _____ domain. Correct answer- attribute Proper data _______ design requires carefully defined and controlled data redundancies to function properly. Correct answer- warehousing
According to Codd's _____ rule of relational database, "Application programs and ad hoc facilities are logically unaffected when changes are made to the table structures that preserve the original table values (changing order of columns or inserting columns)." A comprehensive data sublanguage B logical data independence C nonsubversion D integrity independence Correct answer- B Only a single attribute, not multiple attributes, can define functional dependence. A False B True Correct answer- A ____, also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition. A SELECT B DIFFERENCE C UNION D INTERSECT Correct answer- A The one to many (1:M) relationship is easily implemented in the relational model by putting the foreign key of the "1" side in the table of the "many" side as a primary key. A True B False Correct answer- B _____ logic, used extensively in mathematics, provides a framework in which an assertion (statement of fact) can be verified as either true or false. A Database
