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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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How can I get off this error? 

### SQL Table Creation Exercise This section demonstrates an SQL code snippet intended to create a table in a database. Here is the code provided in the example: ```sql CREATE TABLE SALES_REP ( REP_ID CHAR(2) PRIMARY KEY, FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(20), ADDRESS VARCHAR(30), CITY VARCHAR(15), STATE CHAR(2), POSTAL CHAR(5), CELL_PHONE CHAR(12), COMMISSION NUMERIC(7, 2), RATE NUMERIC(3, 2) ); ``` **Explanation:** - **REP_ID CHAR(2) PRIMARY KEY**: This field stores a two-character representative ID and serves as the primary key. - **FIRST_NAME VARCHAR(20)**: This field stores the first name of the sales representative, with a maximum length of 20 characters. - **LAST_NAME VARCHAR(20)**: This field stores the last name of the sales representative, with a maximum length of 20 characters. - **ADDRESS VARCHAR(30)**: This field stores the address, with a maximum length of 30 characters. - **CITY VARCHAR(15)**: This field stores the city name, with a maximum length of 15 characters. - **STATE CHAR(2)**: This field stores the state code, with a fixed length of 2 characters. - **POSTAL CHAR(5)**: This field stores the postal code, with a fixed length of 5 characters. - **CELL_PHONE CHAR(12)**: This field stores the cell phone number, with a fixed length of 12 characters. - **COMMISSION NUMERIC(7, 2)**: This field stores commission values in a numeric format, with up to 7 digits and 2 decimal places. - **RATE NUMERIC(3, 2)**: This field stores rate values in a numeric format, with up to 3 digits and 2 decimal places. ### Error Handling The log note at the bottom of the code execution window reads: ``` ERROR 1050 (42S01) at line 1: Table 'SALES_REP' already exists ``` **Explanation:** - This error indicates that an attempt was made to create a table named `SALES_REP`, but it already exists in the database. This situation requires either deletion of the existing table or altering the SQL command to account for the existing table structure. ###
Transcribed Image Text:### SQL Table Creation Exercise This section demonstrates an SQL code snippet intended to create a table in a database. Here is the code provided in the example: ```sql CREATE TABLE SALES_REP ( REP_ID CHAR(2) PRIMARY KEY, FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(20), ADDRESS VARCHAR(30), CITY VARCHAR(15), STATE CHAR(2), POSTAL CHAR(5), CELL_PHONE CHAR(12), COMMISSION NUMERIC(7, 2), RATE NUMERIC(3, 2) ); ``` **Explanation:** - **REP_ID CHAR(2) PRIMARY KEY**: This field stores a two-character representative ID and serves as the primary key. - **FIRST_NAME VARCHAR(20)**: This field stores the first name of the sales representative, with a maximum length of 20 characters. - **LAST_NAME VARCHAR(20)**: This field stores the last name of the sales representative, with a maximum length of 20 characters. - **ADDRESS VARCHAR(30)**: This field stores the address, with a maximum length of 30 characters. - **CITY VARCHAR(15)**: This field stores the city name, with a maximum length of 15 characters. - **STATE CHAR(2)**: This field stores the state code, with a fixed length of 2 characters. - **POSTAL CHAR(5)**: This field stores the postal code, with a fixed length of 5 characters. - **CELL_PHONE CHAR(12)**: This field stores the cell phone number, with a fixed length of 12 characters. - **COMMISSION NUMERIC(7, 2)**: This field stores commission values in a numeric format, with up to 7 digits and 2 decimal places. - **RATE NUMERIC(3, 2)**: This field stores rate values in a numeric format, with up to 3 digits and 2 decimal places. ### Error Handling The log note at the bottom of the code execution window reads: ``` ERROR 1050 (42S01) at line 1: Table 'SALES_REP' already exists ``` **Explanation:** - This error indicates that an attempt was made to create a table named `SALES_REP`, but it already exists in the database. This situation requires either deletion of the existing table or altering the SQL command to account for the existing table structure. ###
**Task Overview: Creating a Sales Representative Table** ### Task 1: - **Objective:** Create a table named `REP` which has the same structure as the `SALES_REP` table. - **Columns Overview:** - Exclude `COMMISSION` and `RATE` columns from the original structure. - Columns should use the `NUMERIC` data type where applicable. - **Procedure:** - Use the `DESCRIBE SALES_REP;` command to understand the layout and features of the `REP` table. ### SQL Query: ```sql CREATE TABLE SALES_REP ( REP_ID CHAR(2) PRIMARY KEY, FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(20), ADDRESS VARCHAR(20), CITY VARCHAR(15), STATE CHAR(2), POSTAL CHAR(9), CELL_PHONE CHAR(12), COMMISSION NUMERIC(2, 1), RATE NUMERIC(3, 2) ); ``` ### Error Message: - `ERROR 1050 (42501): Table 'SALES_REP' already exists` ### Task 2: - **Step:** Add a new row to the `REP` table: - `rep ID`: 35 - `first name`: Fred - `last name`: Kiser - `address`: 427 Billings Dr. - `city`: Cody - `state`: WY ### Notes: - The table creation may be unnecessary as the table already exists, requiring adjustments or additions in the existing structure. - Ensure consistency with existing database structures.
Transcribed Image Text:**Task Overview: Creating a Sales Representative Table** ### Task 1: - **Objective:** Create a table named `REP` which has the same structure as the `SALES_REP` table. - **Columns Overview:** - Exclude `COMMISSION` and `RATE` columns from the original structure. - Columns should use the `NUMERIC` data type where applicable. - **Procedure:** - Use the `DESCRIBE SALES_REP;` command to understand the layout and features of the `REP` table. ### SQL Query: ```sql CREATE TABLE SALES_REP ( REP_ID CHAR(2) PRIMARY KEY, FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(20), ADDRESS VARCHAR(20), CITY VARCHAR(15), STATE CHAR(2), POSTAL CHAR(9), CELL_PHONE CHAR(12), COMMISSION NUMERIC(2, 1), RATE NUMERIC(3, 2) ); ``` ### Error Message: - `ERROR 1050 (42501): Table 'SALES_REP' already exists` ### Task 2: - **Step:** Add a new row to the `REP` table: - `rep ID`: 35 - `first name`: Fred - `last name`: Kiser - `address`: 427 Billings Dr. - `city`: Cody - `state`: WY ### Notes: - The table creation may be unnecessary as the table already exists, requiring adjustments or additions in the existing structure. - Ensure consistency with existing database structures.
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