Exam 3: Creating Tables

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Why does the POSTAL_CODE column in the REP table have a data type of CHAR,if a postal code is made up of numbers?​

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Even though the POSTAL_CODE column contains numbers,those numbers are not used in calculations.Therefore,the column should have a CHAR data type.​

SQL is Structured ____________________ Language.​

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To list all the columns in a table,use the LIST COLUMNS command.​

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In Oracle 11g Express,you enter and run commands using the SQL ____________________ tool.​

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Unlike Oracle,Access does not support the DECIMAL data type.​

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To view data in a table,use the VIEW command.​

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Microsoft SQL Server is a DBMS designed for use in client-server applications.​

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This text uses Oracle Database 11g Express Edition as the DBMS in which to create and run SQL commands.​

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When adding rows to character columns,make sure you enclose the values in single quotation marks.​

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The ____ command defines a table's structure by listing its columns,data types,and column lengths.​

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A ____ file is a text file with a .sql extension that contains SQL commands.​

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You can use a special value to represent situations in which an actual value is unknown,unavailable,or not applicable.This special value is called a(n)____________________ data value.​

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You must enclose values in ____________________ quotation marks for any column whose type is character (CHAR),even when the data contains numbers.​

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In general,SQL is case-sensitive.​

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In Oracle,the data type STRING(n)stores a character string n characters long.​

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In this text,SQL commands are illustrated using ____________________.​

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For any column whose data type is CHAR,values must be enclosed in ____.​

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To enter a null value into a table,you use a special format of the NULL command.​

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Should a user be allowed to enter null values for the primary key?​

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How can you correct errors in data?​

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