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Update DBMS/SQL/Week7/writeup.md

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Aadit Agrawal 2025-02-18 15:07:22 +05:30
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DBMS/SQL/Week7/writeup.md
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@ -42,7 +42,7 @@ Driver_id: 1235 Name: Rohit Address: Banglalore India
``` ```
### Q2. Create a trigger that updates a `total_damage` column in the `accident` table whenever a new entry is added to or removed from the participated field.` ### Q2. Create a trigger that updates a `total_damage` column in the `accident` table whenever a new entry is added to or removed from the participated field.`
Trigger:
```SQL ```SQL
SQL> CREATE OR REPLACE TRIGGER update_total_damage SQL> CREATE OR REPLACE TRIGGER update_total_damage
2 AFTER 2 AFTER
@ -62,9 +62,11 @@ SQL> CREATE OR REPLACE TRIGGER update_total_damage
Trigger created. Trigger created.
``` ```
Adding an identifier `total_damage`:
```sql ```sql
SQL> ALTER TABLE ACCIDENT ADD total_damage NUMBER; SQL> ALTER TABLE ACCIDENT ADD total_damage NUMBER;
``` ```
Test case with Insertion:
```sql ```sql
SQL> INSERT INTO SQL> INSERT INTO
PARTICIPATED (driver_id#, regno, report_number, damage_amount) PARTICIPATED (driver_id#, regno, report_number, damage_amount)
@ -84,7 +86,9 @@ SQL> SELECT
REPORT_NUMBER TOTAL_DAMAGE REPORT_NUMBER TOTAL_DAMAGE
------------- ------------ ------------- ------------
1 15000 1 15000
```
Test case with Deletion:
```sql
SQL> DELETE FROM PARTICIPATED SQL> DELETE FROM PARTICIPATED
WHERE WHERE
driver_id# = '1235' driver_id# = '1235'