Adds notes.

database/notes/08-window-functions-worksheet.md

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+# Window functions worksheet
+
+1. Print the student names along with the number of students in their batch.
+
+```sql
+```
+
+2. Print the student names along with the average IQ of their batch.
+
+```sql
+```
+
+3. Print the student names along with the maximum IQ of their batch.
+
+```sql
+```
+
+4. Print the student names along with their rank based on IQ.
+
+```sql
+```
+
+5. Print the student names along with their rank in their batch based on IQ.
+
+```sql
+```
+
+6. Print the student names along with their rank in their batch based on IQ. Ties should not increase the rank.
+
+```sql
+```
+
+7. Print the student names along with their rank in their batch based on IQ. Ties should not be counted and broken by ID.
+
+```sql
+```
+
+8. Find the rank of batches based on the start date of the batch.
+
+```sql
+```
+
+9. Sort the instructors by the first and last name and assign them a roll number.
+
+```sql
+```