SQL for Database Construction and Application Processing (7)
Which SQL keyword is used to impose restrictions on a table, data or relationship? A) SET B) CREATE C) SELECT D) CONSTRAINT
D
Which SQL statement is used to retrieve view instances? A) CREATE B) DELETE C) INSERT D) SELECT
D
Which of the following is an SQL trigger Microsoft SQL Server supports? A) BEFORE B) INSTEAD OF C) AFTER D) Both B and C are correct
D
Which of the following is not an ANSI SQL trigger? A) BEFORE UPDATE B) INSTEAD OF UPDATE C) AFTER INSERT D) INSTEAD OF CONSTRAINT
D
Which of the following is not an SQL trigger Oracle supports? A) BEFORE B) INSTEAD OF C) AFTER D) DURING
D
Because SQL stored procedures allow and encourage code sharing among developers, stored procedures give database application developers the advantages of less work, standardized processing, and specialization among developers.
True
Data values to be added to a table are specified by using the SQL VALUES clause.
True
If the table ITEM has a column WEIGHT, and WEIGHT has the data type Numeric (4,2), the value 4321 will be displayed by the DBMS as 43.21
True
If the values in an SQL view are changeable through the view itself, the SQL command UPDATE is used to change the values.
True
If the values in an SQL view are not changeable through the view itself, you may still be able to update the view by using unique application logic. In this case, the specific logic is placed in an INSTEAD OF trigger.
True
One advantage of using the CONSTRAINT command to define a primary key is that the database designer controls the name of the constraint.
True
One or more rows can be added to a table by using the SQL INSERT statement.
True
Rows can be removed from a table by using the SQL DELETE statement.
True
Rows in a table can be changed by using the SQL UPDATE statement.
True
SQL triggers are used for providing default values, validity checking, updating views, and performing referential integrity actions.
True
SQL triggers can be used when the DBMS receives an INSERT request.
True
SQL triggers can be used when the DBMS receives an update request.
True
SQL triggers can be used with SQL operations INSERT, UPDATE, and DELETE.
True
SQL triggers use the ANSI SQL keywords BEFORE, INSTEAD OF, and AFTER.
True
SQL views are constructed from SELECT statements.
True
SQL views are updatable when the view is based on a single table with no computed columns, and all non-null columns are present in the view.
True
SQL views can be used to provide a level of insulation between data processed by applications and the data actually stored in the database tables.
True
Stored procedures have the advantage of greater security, decreased network traffic, SQL optimized by the DBMS compiler, and code sharing.
True
The Oracle DBMS supports the SQL BEFORE trigger.
True
The SQL CREATE TABLE statement is used to name a new table and describe the table's columns.
True
The SQL SET keyword is used to specify a new value when changing a column value.
True
The SQL command SELECT is used to retrieve view instances.
True
The SQL keyword CHECK is used to limit the column values to specific values.
True
The SQL keyword CONSTRAINT can be used in conjunction with the SQL keywords PRIMARY KEY and FOREIGN KEY.
True
The SQL keyword CONSTRAINT is used to define one of several types of constraints.
True
The SQL keyword CONSTRAINT is used to limit the column values to specific values.
True
The SQL keyword PRIMARY KEY is used to designate the column(s) that are the primary key for the table.
True
The SQL keyword UNIQUE is used to define alternate keys.
True
The values in an SQL view are not always changeable through the view itself.
True
Unless it is being used to copy data from one table to another, the SQL INSERT statement can be used to insert only a single row into a table.
True
Unlike application code, stored procedures are never distributed to the client computers
True
When a trigger is fired, the DBMS makes the appropriate data available to the trigger code.
True
If the table PRODUCT has a column PRICE that has the data type Numeric (8,2), the value 12345 will be displayed by the DBMS as ________. A) 123.45 B) 12345 C) 12345.00 D) 123450.00
A
Which SQL keyword is used to add one or more rows of data to a table? A) DELETE B) INSERT C) SELECT D) UPDATE
B
A set of SQL statements stored in an application written in a standard programming language is called ________. A) a stored procedure B) a view C) embedded SQL D) a trigger
C
Because SQL statements are table-oriented, whereas programs are element-oriented, the results of SQL statements used in programs are accessed using ________. A) standard programming tools B) custom written programming tools C) an SQL cursor D) an SQL trigger
C
Given the SQL statement CREATE TABLE SALESREP ( SalesRepNo int NOT NULL, RepName char(35) NOT NULL, HireDate date NOT NULL, CONSTRAINT SalesRepPK PRIMARY KEY (SalesRepNo), CONSTRAINT SalesRepAK1 UNIQUE (RepName) ); we know that ________. A) RepName is the primary key B) RepName is a foreign key C) RepName is a candidate key D) RepName is a surrogate key
C
A stored program that is attached to a table or view is called ________. A) a CHECK constraint B) a view C) embedded SQL D) a trigger
D
Which SQL keyword is used to change one or more rows in a table? A) MODIFY B) INSERT C) SELECT D) UPDATE
D
A stored program that is stored within the database and compiled when used is called a trigger.
False
According to the SQL-92 standard, statements used to construct views cannot contain the WHERE clause.
False
If a trigger is being written to enforce referential integrity actions, you cannot use an INSTEAD OF trigger.
False
If the table PRODUCT has a column PRICE, and PRICE has the data type Numeric (8,2), the value 98765 stored in that field will be displayed by the DBMS as 98765.00
False
SQL triggers are created using the SQL ADD TRIGGER statement.
False
The SQL Server DBMS supports the SQL BEFORE trigger.
False
The SQL command CREATE USER VIEW is used to create a virtual table.
False
A set of SQL statements stored in an application written in a standard programming language is called embedded SQL
True
An SQL virtual table is called a view.
True
SQL view can be used to hide columns.
True
Which SQL keyword is used to name a new table and describe the table's columns? A) SET B) CREATE C) SELECT D) ALTER
B
Which SQL keyword is used to change the values of an entire column? A) CHANGE B) INSERT C) SELECT D) SET
D
SQL triggers are created using ________. A) the SQL CREATE TRIGGER statement B) the SQL ADD TRIGGER statement C) the SQL TRIGGER statement D) the SQL ADD CONSTRAINT TRIGGER statement
A
SQL triggers can be used when the DBMS receives a(n) ________ request. A) INSERT B) SELECT C) ALTER D) CREATE
A
Which keyword is used to remove one or more rows from a table? A) DELETE B) INSERT C) ERASE D) SET
A
Which of the following does not describe a user-defined function? A) It computes a numeric value B) It can be called by name from within an SQL statement C) It may have input parameters passed to it D) It returns an output value to the calling statement
A
The SQL keyword used to limit column values to specific values is ________. A) CONSTRAINT B) CHECK C) NOT NULL D) UNIQUE
B
Which SQL keyword is used to delete a table's structure? A) DELETE B) DROP C) DISPOSE D) ALTER
B
An SQL virtual table is called ________. A) a CHECK constraint B) a view C) embedded SQL D) a trigger
B
Based on the table below, a function to compute a 10% late penalty on a customer's balance would have how many input parameters? CUSTOMER CustNo CustName Balance SalesRepNo 9870 Winston 500 345 8590 Gonzales 350 434 7840 Harris 800 654 4870 Miles 100 345 A) 0 B) 1 C) 2 D) it doesn't matter
B
If the values in an SQL view are not changeable through the view itself, you may still be able to update the view by using unique application logic. In this case, the specific logic is placed in ________. A) a BEFORE trigger B) an INSTEAD OF trigger C) an AFTER trigger D) Depending on the specific logic, either A or B can be used.
B
Referential integrity constraints are implemented in SQL using the ________ syntax. A) PRIMARY KEY B) FOREIGN KEY C) DEFAULT D) UNIQUE
B
Stored procedures have all these advantages except ________. A) greater security B) faster development C) SQL optimized by the DBMS compiler D) code sharing
B
The SQL command used to create a virtual table is ________. A) CREATE VTABLE B) CREATE VIEW C) VTABLE D) VIEW
B
Which of the following illustrates the authors' preferred style of defining a primary key? A) CREATE TABLE CUSTOMER ( CustomerID Integer Primary Key LastName Char(35) Not Null First Name Char(25) Null ); B) CREATE TABLE CUSTOMER ( CustomerID Integer Not Null LastName Char(35) Not Null First Name Char(25) Null CONSTRAINT CustomerPK PRIMARY KEY (CustomerID) ); C) CREATE TABLE CUSTOMER ( CustomerID Integer Not Null LastName Char(35) Not Null First Name Char(25) Null ); ALTER TABLE CUSTOMER ADD CONSTRAINT CustomerPK PRIMARY KEY (CustomerID); D) Both B and C are correct
B
If you have a foreign key in a CUSTOMER table that references the primary key in a SALESREP table, the ON DELETE CASCADE syntax means that ________. A) when a CUSTOMER is deleted, that CUSTOMER's SALESREP is also deleted B) when a CUSTOMER is deleted, all SALESREPS are also deleted C) when a SALESREP is deleted, all CUSTOMERs of that SALESREP are also deleted D) when the SALESREP table is dropped, all CUSTOMERs must be deleted
C
One advantage of using the CONSTRAINT phrase to define a primary key is that the database designer controls the ________. A) name of the table B) name of the foreign key field C) name of the constraint D) name of the primary key field
C
When the correct SQL command is used to delete a table's structure, what happens to the data in the table? A) If the deleted table was a parent table, the data is added to the appropriate rows of the child table. B) If the deleted table was a child table, the data is added to the appropriate rows of the parent table. C) The data in the table is also deleted. D) Nothing because there was no data in the table since only an empty table can be deleted.
C
A stored program that is attached to the database is called ________. A) a view B) embedded SQL C) a trigger D) a stored procedure
D
According to the SQL-92 standard, statements used to construct views cannot contain ________. A) the SELECT clause B) the FROM clause C) the WHERE clause D) the ORDER BY clause
D
Based on the tables below, which of the following SQL statements would increase the balance of the Gonzales account by $100 to a total of $450? GENERAL SALES DATABASE: SALESREP SalesRepNo RepName HireDate 654 Jones 01/02/2005 734 Smith 02/03/2007 345 Chen 01/25/2004 434 Johnson 11/23/2004 CUSTOMER CustNo CustName Balance SalesRepNo 9870 Winston 500 345 8590 Gonzales 350 434 7840 Harris 800 654 4870 Miles 100 345 A) SELECT Gonzales FROM CUSTOMER INSERT VALUES PLUS (100) INTO Balance; B) SELECT Gonzales FROM CUSTOMER INSERT VALUES (450) INTO Balance; C) INSERT INTO CUSTOMER VALUES (450) SELECT Balance WHERE CustName = 'Gonzales'; D) UPDATE CUSTOMER SET Balance = 450 WHERE CustName = 'Gonzales';
D
Because SQL statements are set-oriented, whereas programs are element-oriented, the results of SQL statements used in programs are treated as ________. A) tables B) rows C) files D) pseudofiles
D
Because SQL stored procedures allow and encourage code sharing among developers, stored procedures give database application developers all these advantages except ________. A) less work B) standardized processing C) specialization among developers D) faster query response times
D
If the values in an SQL view are changeable through the view itself, which SQL statement is used to change the values? A) CREATE B) DELETE C) INSERT D) UPDATE
D
SQL triggers are not used for ________. A) validity checking B) providing default values C) updating views D) creating tables
D
SQL views are always updatable when ________. A) the view is based on a single table with no computed columns, and all non-null columns are present in the view B) the view is based on any number of tables, with or without computed columns, and the INSTEAD OF trigger is defined for the view C) the view is based on multiple tables, the update is being done on the most subordinate table, and the rows of that table can be uniquely identified D) Both A and B are correct
D
SQL views are constructed from ________. A) CREATE statements B) INSERT statements C) UPDATE statements D) SELECT statements
D
SQL views are not used ________. A) to hide columns B) to show results of computed columns C) to hide complicated SQL statements D) to enforce primary key constraints
D
To set a column value to an initial value that is selected according to some business logic, you would use ________. A) the SQL DEFAULT constraint with the CREATE TABLE command B) an SQL view C) embedded SQL D) an SQL trigger
D
When a trigger is fired, the DBMS makes the appropriate data available to ________. A) the SQL interpreter B) the application code C) the embedded SQL code D) the trigger code
D
Which SQL keyword is used to change the structure, properties or constraints of a table? A) SET B) CREATE C) SELECT D) ALTER
D
A stored program that is attached to a table or view is called a stored procedure.
False
The SQL keyword DELETE is used to delete a table's structure.
False
The SQL keyword MODIFY is used to change a column value.
False
The SQL keyword MODIFY is used to change the structure, properties, and constraints of a table.
False
The values in an SQL view are always changeable through the view itself.
False
To set a column value that is selected according to some complicated business logic, you would use the SQL DEFAULT constraint with the CREATE TABLE command
False
When the correct SQL command is used to delete a table's structure, the command can only be used with a table that has already had its data removed.
False
Because SQL statements are table-oriented, whereas programs are variable-oriented, the results of SQL statements used in programs are treated as pseudofiles.
True
Because SQL statements are table-oriented, whereas programs are variable-oriented, the results of SQL statements used in programs are accessed using an SQL cursor.
True