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15. The correct syntax for a REFERENTIAL CONSTRAINT is a. [CONSTRAINT constraint_name] REFERENCES index_name b. [CONSTRAINT constraint_name] REFERENCES table_name c. FOREIGN KEY column_name REFERENCES table_name (column_ name) d. REFERENCES table_name (column_name) e. column_name REFERENCES UNIQUE table_name 16. The CREATE INDEX statement a. Is used to create unique and primary key constraints b. May include the keyword UNIQUE c. Must reference two or more column names d. May include the ASC or DSC keyword for any column e. May specify ascending or descending for one or more columns 17. The CREATE VIEW statement a. Stores a query in the database b. May include an optional CASCADE keyword c. May include an optional OR REPLACE keyword d. Must contain a valid DML command e. Must contain a valid SELECT statement 18. Valid uses of the ALTER TABLE statement include a. Adding columns b. Changing column precision or length c. Renaming a table d. Dropping a primary key constraint e. Adding a primary key constraint 19. An ALTER TABLE statement cannot be used to a. Change a column s data type to a numeric type if the column contains non-numeric data b. Rename a column c. Change a NULL constraint to NOT NULL for a column that contains NULL values
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CHAPTER 3 De ning Database Objects Using SQL
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d. Drop a foreign key constraint when the constraint references a primary key e. Drop a primary key constraint if there are foreign keys referencing the primary key 20. The DROP statement can be used to drop a a. Referential constraint b. Index c. Table d. Table column e. View
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Retrieving Data Using Data Query Language (DQL)
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The SQL Data Query Language (DQL) includes only one command, but it s a very important one: SELECT. The SELECT command is used to retrieve data from the database (without modifying it) so that it can be processed by an application program or simply displayed for an individual. It is undoubtedly the most commonly used SQL command. Many database users use the term SELECT statement when referring to SQL statements that use the SELECT command. The result of a SELECT statement, which is called a result set, is always returned in the form of
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a table (that is, in rows and columns). Keep in mind that SQL is a nonprocedural language, so you specify the result that you want (that is, the way you want the result set to be returned) rather than how to achieve it.
The Basic SELECT Statement
The most basic SELECT statement contains two clauses: SELECT [DISTINCT] Lists the columns that are to be returned in the result set, separated by commas. The asterisk symbol (*) may be used in place of a column list in order to select all columns in a table or view. This is a useful feature for quickly listing data, but it should be avoided in statements that will be reused because it compromises logical data independence any new column added to the table or view will be automatically selected the next time the statement is run, and this may not be a desirable result. The keyword DISTINCT may be added after the SELECT keyword to eliminate any duplicate rows in the query results. FROM Lists the tables or views from which data is to be selected. A synonym, which is an alias for a table or view that is de ned in the database, may be used in place of the real name for the table or view. Actually, the FROM clause isn t quite as straightforward as it sounds. Most relational DBMSs provide functions that return system level data that does not reside in a table or view, such as the current date and time, which is provided in Oracle by the CURRENT_DATE function, and in Microsoft SQL Server by the getdate() function. Moreover, in Microsoft SQL Server, it is permissible to omit the FROM clause in a SELECT statement if none of the data being retrieved comes from a table or view. In most, if not all, other SQL implementations, the FROM clause is mandatory. Oracle has an unusual feature it provides a dummy table called DUAL that can be used when none of the columns in the SELECT statement comes from a real table or view. The following example selects the MOVIE_GENRE, MPAA_RATING_CODE, and MOVIE_TITLE columns from the MOVIE table. There are 20 movies in the sample MOVIE table, but only the rst four are shown here.
SELECT MOVIE_GENRE_CODE, MPAA_RATING_CODE, MOVIE_TITLE FROM MOVIE;
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