Update DBMS/SQL/Week6/writeup.md

DBMS/SQL/Week6/writeup.md

@@ -76,20 +76,20 @@ PL/SQL procedure successfully completed.
 
 ```SQL
 SQL> CREATE OR REPLACE PROCEDURE GetDriversWithoutAccidents AS
-  2  BEGIN
+    begin
-  3      FOR rec IN (
+        for rec in (
-  4          SELECT p.DRIVER_ID#, p.NAME, p.ADDRESS
+            select p.driver_id#, p.name, p.address
-  5          FROM person p
+            from person p
-  6          LEFT JOIN participated pa ON p.DRIVER_ID# = pa.DRIVER_ID#
+            left join participated pa on p.driver_id# = pa.driver_id#
-  7          WHERE pa.REPORT_NUMBER IS NULL
+            where pa.report_number is null
-  8      ) LOOP
+        ) loop
-  9          DBMS_OUTPUT.PUT_LINE('Driver ID: ' || rec.DRIVER_ID# ||
+            dbms_output.put_line('driver id: ' || rec.driver_id# ||
 
- 10                               ', Name: ' || rec.NAME ||
+                                 ', name: ' || rec.name ||
- 11                               ', Address: ' || rec.ADDRESS);
+                                 ', address: ' || rec.address);
- 12      END LOOP;
+        end loop;
- 13  END;
+    end;
- 14  /
+    /
 
 Procedure created.
 ```
@@ -101,3 +101,33 @@ Driver ID: 1235, Name: Rohit, Address: Banglalore India
 PL/SQL procedure successfully completed.
 ```
 
+Q5. Write a function that takes a REGNO as input and returns the total number of accidents in which the car was involved
+```sql
+SQL> create or replace function gettotalaccidentsbyregno(p_regno in varchar2)
+    return number
+    is
+        v_total_accidents number;
+    begin
+        select count(*)
+        into v_total_accidents
+        from participated
+        where regno = p_regno;
+        return v_total_accidents;
+    exception
+        when no_data_found then
+            return 0;
+        when others then
+            raise;
+    end;
+    /
+
+Function created.
+```
+```SQL
+SQL> SELECT GetTotalAccidentsByRegno('ABCD0001') AS Total_Accidents
+  2  FROM dual;
+
+TOTAL_ACCIDENTS
+---------------
+              1
+```