Update SQL_Class_4.txt

Author: shashank-mishra219

SQL_Class_4.txt

@@ -73,6 +73,43 @@ create table customer_order_data
     cust_country varchar(50)
 );
 
+
+# Case When in SQL
+Create table student_marks
+(
+    stu_id int,
+    stu_name varchar(50),
+    total_marks int
+);
+
+insert into student_marks values(1,'Shashank',50);
+insert into student_marks values(2,'Rahul',91);
+insert into student_marks values(3,'Amit',74);
+insert into student_marks values(4,'Nikhil',65);
+insert into student_marks values(5,'Rohit',86);
+insert into student_marks values(6,'Deepak',77);
+
+select * from student_marks;
+
+# Write a query to caluclate the grades for a student by following below criteria
+# marks >= 90 , grade A+
+# marks < 90 and marks >=85, grade A
+# marks < 85 and marks >=75, grade B+
+# marks < 75 and marks >=60, grade B
+# marks < 60 , grade C
+
+select stu_id,
+       stu_name,
+       total_marks,
+       case 
+            when total_marks >=90 then 'A+'
+            when total_marks >= 85 and total_marks < 90 then 'A'
+            when total_marks >= 75 and total_marks < 85 then 'B+'
+            when total_marks >= 60 and total_marks < 75 then 'B'
+            else 'C'
+       end as grade
+from student_marks;
+
 insert into customer_order_data values(101,200,300,'USA'),(102,201,301,'INDIA'),(103,202,302,'USA'),(104,203,303,'UK');
 
 create table supplier_data