1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to u
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to u
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
Related questions
Question
#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

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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