Database ch 7 – Flashcards
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The command is used with the ALTER TABLE command to modify the table by deleting a column.
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drop
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In Oracle, the command is used to change the display for a column, for example, to place a $ in front of a numeric value.
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format
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The COUNT function is designed to tally the number of non-null "values" of an attribute, and is often used in conjunction with the DISTINCT clause.
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true
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You cannot insert a row containing a null attribute value using SQL.
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false
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The COMMIT command does not permanently save all changes. In order to do that, you must use SAVE.
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false
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String comparisons are made from left to right
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true
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The conditional LIKE must be used in conjunction with wildcard characters.
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true
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Mathematical operators cannot be used to place restrictions on character-based attributes.
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false
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SQL requires the use of the ADD command to enter data into a table.
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false
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To list the contents of a table, you must use the DISPLAY command.
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false
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Data type selection is usually dictated by the nature of the data and by the intended use.
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true
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A database language enables the user to perform complex queries designed to transform the raw data into useful information.
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true
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A table can be deleted from the database by using the command.
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drop
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The SQL command that allows a user to list the contents of a table is .
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select
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A(n) is an alternate name given to a column or table in any SQL statement.
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alias
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SQL is considered difficult to learn; its command set has a vocabulary of more than 300 words.
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false
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Any changes made to the contents of a table are not physically saved on disk until you use the SAVE command.
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false
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The SQL command that modifies an attribute's values in one or more table's rows is _____.
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update
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Only numeric data types can be added and subtracted in SQL.
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false
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Date procedures are often more software-specific than other SQL procedures.
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true
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All SQL commands must be issued on a single line.
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false
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The command would be used to delete the table row where the P_CODE is 'BRT-345'.
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DELETE FROM PRODUCT WHERE P_CODE = 'BRT-345';
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The SQL command that allows a user to insert rows into a table is .
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insert
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A database language enables the user to create database and table structures to perform basic data management chores.
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true
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The special operator used to check whether an attribute value is within a range of values is .
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between
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The SQL command that allows a user to permanently save data changes is .
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commit
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To list all the contents of the PRODUCT table, a user would use .
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wildcard
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An example of a command a user would use when making changes to a PRODUCT table is .
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update
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