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38. Column name quali ers a. May be a column alias de ned in the FROM clause b. May be a table alias de ned in the FROM clause c. May be a table name d. Resolve ambiguous column references e. May be a number denoting the relative position of the table in the FROM list 39. A correlated subselect a. Has a nested select that references column values from the outer select b. Has a nested select that makes no reference to the column values in the outer select c. Runs more ef ciently than a noncorrelated subselect d. Runs less ef ciently than a noncorrelated subselect e. Has an outer select that references column values from the inner select 40. SQL functions a. Can be used in the WHERE clause of an SQL statement b. Can be used as a table name alias in an SQL statement c. Can be used in the column list of an SQL statement d. Return a set of values e. Return a single value 41. The RTRIM function a. Removes trailing spaces from character strings b. Removes leading spaces from character strings c. Can be nested with other functions d. Replaces null values with other values in character strings e. Removes both leading and trailing spaces from character strings 42. CASE expressions a. Come in two forms named static and dynamic b. Come in two forms named simple and searched c. Come in two forms named standard and searched d. Come in two forms named searched and nonsearched e. Allow for conditional execution of clauses within an SQL statement
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43. A DML statement may reference a. View columns that come from multiple tables b. View columns that come from a single table c. Columns from multiple tables d. Columns from a single table e. A view that contains columns from only one table
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44. When forming DML statements, the following types of constraints must be considered: a. Referential constraints b. Primary key constraints c. NOT NULL constraints d. Unique constraints e. Security constraints 45. An INSERT statement with a VALUES clause a. May use the keyword NULL to assign null values to columns b. Can insert multiple rows with one statement execution c. Must have a column list d. Must have a values list e. May include a WHERE clause 46. An UPDATE statement without a WHERE clause a. Fails with an error condition b. Results in a Cartesian product c. Updates all rows in the table to null values d. Attempts to update every row in the table e. Deletes all rows in the table 47. An UPDATE statement a. Must include a WHERE clause b. May set a column to the value of another column c. May set columns of multiple tables to new values d. Must include a SET clause e. Must provide a new value for at least one column
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48. A DELETE statement a. May include an optional WHERE clause b. May use the FORCE keyword to force deletion of rows c. May include an optional column list d. Cannot violate any referential constraints on the table e. May have a nested SELECT as part of the WHERE clause 49. The SET clause in an UPDATE statement may assign a value to a column that is a. A list of values b. A constant c. Another column name d. Any expression that yields a single value e. The NULL keyword 50. Security is necessary because a. Honest people make mistakes b. Databases connected to the Internet are vulnerable c. 80 percent of fraud is committed by outside hackers d. Application security controls alone are inadequate e. Security controls keep people honest 51. Intruders who attempt to penetrate systems connected to the Internet include a. Disgruntled employees b. Spies from competitors c. Bank auditors d. Web bloggers e. Hackers 52. Components that must be secured include a. Networks b. Operating systems c. Servers d. Client workstations e. Databases
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53. System privileges a. Are speci c to a database object b. Vary across databases from different vendors
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