Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Single Table
In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.
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#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use

The image displays an SQL query execution attempt in a database management interface, which results in an error. Below is the transcription and explanation for educational purposes: ### SQL Query Attempt: 1. **SQL Code:** ```sql CREATE OR REPLACE TRIGGER TRG_LINE_TOTAL BEFORE INSERT ON LINE FOR EACH ROW BEGIN :NEW.LINE_TOTAL := :NEW.LINE_UNITS * :NEW.LINE_PRICE; END; / ``` ### Explanation: - **Trigger Definition:** - A trigger named `TRG_LINE_TOTAL` is created or replaced. - It is set to execute before inserting a row into the `LINE` table. - The purpose is to calculate the `LINE_TOTAL` value by multiplying `LINE_UNITS` and `LINE_PRICE` for each row. ### Error Details: - **Error Message:** ``` MySQL said: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ':NEW.LINE_TOTAL := :NEW.LINE_UNITS * :NEW.LINE_PRICE' at line 5 ``` #### Explanation of the Error: - **Error Code:** #1064 - **Description:** There is a syntax error in the SQL query, specifically in the line attempting to set `:NEW.LINE_TOTAL`. - **Cause:** This syntax is incorrect for MySQL/MariaDB, where the use of `:NEW` for referencing new column values in a trigger is invalid. The `:=` assignment operator and colon-prefixed syntax are often used in PL/SQL, not in MySQL/MariaDB. ### Suggested Correction: In MySQL, a similar operation should be written differently, typically using a `SET` statement. For example: ```sql CREATE TRIGGER TRG_LINE_TOTAL BEFORE INSERT ON LINE FOR EACH ROW BEGIN SET NEW.LINE_TOTAL = NEW.LINE_UNITS * NEW.LINE_PRICE; END; ``` ### Educational Note: - **Triggers:** Useful for automatically applying business rules or updating fields during insert, update, or delete operations on tables. - **Syntax Compatibility:** Always ensure compatibility with the SQL dialect used by the specific database system. MySQL and MariaDB have different syntax rules compared to Oracle's PL/SQL.
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Transcribed Image Text:The image displays an SQL query execution attempt in a database management interface, which results in an error. Below is the transcription and explanation for educational purposes: ### SQL Query Attempt: 1. **SQL Code:** ```sql CREATE OR REPLACE TRIGGER TRG_LINE_TOTAL BEFORE INSERT ON LINE FOR EACH ROW BEGIN :NEW.LINE_TOTAL := :NEW.LINE_UNITS * :NEW.LINE_PRICE; END; / ``` ### Explanation: - **Trigger Definition:** - A trigger named `TRG_LINE_TOTAL` is created or replaced. - It is set to execute before inserting a row into the `LINE` table. - The purpose is to calculate the `LINE_TOTAL` value by multiplying `LINE_UNITS` and `LINE_PRICE` for each row. ### Error Details: - **Error Message:** ``` MySQL said: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ':NEW.LINE_TOTAL := :NEW.LINE_UNITS * :NEW.LINE_PRICE' at line 5 ``` #### Explanation of the Error: - **Error Code:** #1064 - **Description:** There is a syntax error in the SQL query, specifically in the line attempting to set `:NEW.LINE_TOTAL`. - **Cause:** This syntax is incorrect for MySQL/MariaDB, where the use of `:NEW` for referencing new column values in a trigger is invalid. The `:=` assignment operator and colon-prefixed syntax are often used in PL/SQL, not in MySQL/MariaDB. ### Suggested Correction: In MySQL, a similar operation should be written differently, typically using a `SET` statement. For example: ```sql CREATE TRIGGER TRG_LINE_TOTAL BEFORE INSERT ON LINE FOR EACH ROW BEGIN SET NEW.LINE_TOTAL = NEW.LINE_UNITS * NEW.LINE_PRICE; END; ``` ### Educational Note: - **Triggers:** Useful for automatically applying business rules or updating fields during insert, update, or delete operations on tables. - **Syntax Compatibility:** Always ensure compatibility with the SQL dialect used by the specific database system. MySQL and MariaDB have different syntax rules compared to Oracle's PL/SQL.
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